**Description:**

Sixth-grade student, "Bob", explains and shows how to make a factor tree and shows us prime factorization.

**Duration:** 00:03:02 / **Uploaded:** 2008-03-28 00:00:00

**Description:**

Jerry shows us the Ladder Method for finding the LCM and GCF. CCSS.Math.Content.6.NS.B.4

**Duration:** 00:01:45 / **Uploaded:** 2009-11-10 00:00:00

**Description:**

Same video as http://www.mathtrain.tv/play.php?vid=133, but with captions. Phillip gives us a quick look at dividing fractions.

**Duration:** 00:00:46 / **Uploaded:** 2008-08-08 00:00:00

**Description:**

"Paul", a middle school student, teaches us how to use cross-cancellation to make multiplying fractions easier.

**Duration:** 00:01:18 / **Uploaded:** 2008-03-29 00:00:00

**Description:**

6th grader, Taffy, makes her debut showing us how to find a missing angle in a triangle.

**Duration:** 00:00:58 / **Uploaded:** 2009-03-22 00:00:00

**Description:**

6th graders, Ben and Jerry show us a probability example using spinners.

**Duration:** 00:00:55 / **Uploaded:** 2009-06-10 00:00:00

**Description:**

Mr. Marcos with part 2 of how to solve an equation with fractions. This one shows "fraction busters".

**Duration:** 00:01:18 / **Uploaded:** 2008-04-08 00:00:00

**Description:**

Student, Avec Clem, is now in 7th grade. Here she shows us (in French) how to solve exponents. Use the CC (closed caption button at bottom right of video) to read the English subtitles.

**Duration:** 00:01:00 / **Uploaded:** 2012-09-23 00:00:00

**Description:**

6th graders, "Paul" and "Bob", teach us how to round a decimal number. This was Episode 1 of our Mathtrain Podcast on iTunes, back in August 2007.

**Duration:** 00:01:48 / **Uploaded:** 2008-03-27 00:00:00

**Description:**

Find the LCM and GCF using the ladder method with Kermit. Part of the student-created tutorial project at Mathtrain.TV. Mathtrain.TV is a free, educational "kids teaching kids" project from Mr. Marcos and his Students at Lincoln Middle School in Santa Monica, CA.

**Duration:** 00:02:19 / **Uploaded:** 2013-07-18 05:13:49

**Description:**

We find which is the better buy. To do this, we find the rate or unit price of just one can.

**Duration:** 00:02:25 / **Uploaded:** 2011-01-22 00:00:00

**Description:**

Classifying Quadrilaterals, with Mr. Marcos.

**Duration:** 00:02:03 / **Uploaded:** 2009-03-29 00:00:00

**Description:**

A mini review of multiplying exponents with the same base.

**Duration:** 00:02:39 / **Uploaded:** 2016-05-16 01:55:29

**Description:**

A look at how to write repeating decimals as fractions in simplest form.

**Duration:** 00:02:49 / **Uploaded:** 2011-09-13 00:00:00

**Description:**

We have special guest Brian Mull (of November Learning) showing us a cool math multiplication method. Brian created this video with Jing, Tux Paint (both free) and an inexpensive Wacom Bamboo tablet!

**Duration:** 00:01:26 / **Uploaded:** 2008-07-12 00:00:00

**Description:**

Chuck and Larrie show us how to find the surface area of a rectangular prism.

**Duration:** 00:02:00 / **Uploaded:** 2008-05-21 00:00:00

**Description:**

Another debut from two 6th graders, Kermit and Freckles (not their real names). Watch these two simplify a problem using the order of operations (also known as PEMDAS and GEMDAS).

**Duration:** 00:03:01 / **Uploaded:** 2011-10-16 00:00:00

**Description:**

Sixth-grader, Pablo, shows us the Egyptian Method of Multiplication.

**Duration:** 00:01:44 / **Uploaded:** 2008-11-02 00:00:00

**Description:**

This is the captioned version of http://www.mathtrain.tv/play.php?vid=87 . "Bob", a 6th grader, shows us order of operations (PEMDAS, which we teach as GEMDAS).

**Duration:** 00:02:08 / **Uploaded:** 2008-06-22 00:00:00

**Description:**

"Bob" teaches us the Order of Operations. Although many of us learned it as PEMDAS, we replace the "P" (parenthesis) with a "G" to stand for any grouping symbol.

**Duration:** 00:02:08 / **Uploaded:** 2008-03-29 00:00:00

**Description:**

Let's create a tessellation.

**Duration:** 00:02:43 / **Uploaded:** 2012-06-10 00:00:00

**Description:**

This is our 1st Anniversary Mathcast Episode. It was one year ago that our students created our first finished mathcast using my tablet pc. In this episode, "Bob" once again shows us how to solve a proportion problem. This one is a rate and proportion problem taken from Dr. Mary's Punchline book series. CCSS.Math.Content.6.RP.A.3 and CCSS.Math.Content.7.RP.A.1.

**Duration:** 00:01:29 / **Uploaded:** 2008-03-29 00:00:00

**Description:**

Ben shows us Lattice Multiplication.

**Duration:** 00:01:40 / **Uploaded:** 2009-11-07 00:00:00

**Description:**

We show you how we create a screencast.

**Duration:** 00:05:00 / **Uploaded:** 2010-11-28 00:00:00

**Description:**

This goes along with another video we made several years ago. Here, we use pizza as a way to help visual this subtraction of fractions. The alternative video is at http://youtu.be/yXiG2iv1Vq8

Part of our Mathtrain.TV Project.

**Duration:** 00:02:50 / **Uploaded:** 2012-03-03 00:00:00

**Description:**

"Bob" and "Paul" help us with a homework problem about areas of circles on a target.

**Duration:** 00:03:59 / **Uploaded:** 2008-04-05 00:00:00

**Description:**

Another look at finding the percent of a number.

**Duration:** 00:02:49 / **Uploaded:** 2011-02-12 00:00:00

**Description:**

Finding circumference of a circle, with "Bob".

**Duration:** 00:01:45 / **Uploaded:** 2010-08-02 00:00:00

**Description:**

Cool method of multiplying. Years ago, somewhere in Russia, people used this interesting method to multiply. I hear it is still being taught today. Fascinating! It really works!

**Duration:** 00:01:59 / **Uploaded:** 2008-10-18 00:00:00

**Description:**

Shane, a 7th grader, shows us the Vertical Line Test for functions. She created this tutorial on her iPad using ScreenChomp.

**Duration:** 00:02:53 / **Uploaded:** 2014-02-16 08:28:52

**Description:**

This is an early math video, one of the first few made by Mr. Marcos for his students to watch via mathtrain.com. He shows us how to solve a multi-step equation.

**Duration:** 00:01:24 / **Uploaded:** 2008-04-05 00:00:00

**Description:**

Sammy shows us how to use a Chinese Abacus.

**Duration:** 00:01:23 / **Uploaded:** 2008-07-30 00:00:00

**Description:**

8th grader, "Billy Billy", shows us a quick way to remember and solve metric conversions.

**Duration:** 00:02:17 / **Uploaded:** 2008-03-29 00:00:00

**Description:**

Matilda returns from her 8th grade algebra class to show us how to "complete the square".

**Duration:** 00:01:46 / **Uploaded:** 2009-05-02 00:00:00

**Description:**

Sam shows us how to find the LCM, using the prime factorization method.

**Duration:** 00:01:29 / **Uploaded:** 2008-12-21 00:00:00

**Description:**

Debut of "Mike" teaching us how to estimate square roots.

**Duration:** 00:02:12 / **Uploaded:** 2008-07-22 00:00:00

**Description:**

Matilda returns to show us how to multiply polynomials. In algebra class, this distribution method is often called FOIL - First, Outer, Inner and Last. FOIL reminds students the way to multiply polynomials. CCSS.Math.Content.HSA-APR.A.1 .

**Duration:** 00:01:00 / **Uploaded:** 2009-02-21 00:00:00

**Description:**

Middle school students, "Paul" and "Bob", show us how to round a decimal and they give us a way to remember the rules.

**Duration:** 00:02:42 / **Uploaded:** 2008-03-27 00:00:00

**Description:**

Solve to find the rule in the input-output table.

**Duration:** 00:02:01 / **Uploaded:** 2011-12-04 00:00:00

**Description:**

I made this video for my application to the Google Teacher Academy. The topic was Classroom Innovation. It is closed caption (CC) on Google Video, but not here yet. Go view it on Google Video: http://video.google.com/videoplay?docid=-5031618551142055024&hl=en

**Duration:** 00:00:57 / **Uploaded:** 2008-06-09 00:00:00

**Description:**

Arielle and Miller explain

**Duration:** 00:03:05 / **Uploaded:** 2014-01-15 17:30:28

**Description:**

Sixth grader, Selena, makes her debut showing us how to multiply fractions.

**Duration:** 00:00:52 / **Uploaded:** 2012-12-14 00:00:00

**Description:**

Watch papatom explain how to find percents.

**Duration:** 00:02:26 / **Uploaded:** 2011-02-12 00:00:00

**Description:**

Here is a brief look at a Venn Diagram of some Number Sets.

**Duration:** 00:01:12 / **Uploaded:** 2008-10-04 00:00:00

**Description:**

This is one of my first math videos I made. I think I used the computer mic or a cheap Radio Shack mic. The purpose of the video was to have an on-line lesson available to students and parents to review subtracting fractions. Like most of the other videos on this site, it is also available on mathtrain.com and youtube.com.

**Duration:** 00:02:14 / **Uploaded:** 2008-04-05 00:00:00

**Description:**

7th grader, Kermit, returns to show us some fun visual multiplication in this student tutorial. Part of the student-created tutorial project at Mathtrain.TV. Mathtrain.TV is a free, educational...

**Duration:** 00:04:48 / **Uploaded:** 2013-07-11 22:15:05

**Description:**

Poseidon makes his debut explaining the Pythagorean Theorem with a screencast had created on his iPad using Doceri.

**Duration:** 00:03:04 / **Uploaded:** 2013-01-24 00:00:00

**Description:**

Here is a quick look at how to multiply fractions and mixed numbers.

**Duration:** 00:01:27 / **Uploaded:** 2009-01-02 00:00:00

**Description:**

Sixth grader, "Phillip", makes his debut showing us how to divide fractions.

**Duration:** 00:00:46 / **Uploaded:** 2008-06-13 00:00:00

**Description:**

"Solving Proportions using Cross Product" Yes, it's in French. Our first ever! We included the English captions.

**Duration:** 00:01:04 / **Uploaded:** 2012-06-24 00:00:00

**Description:**

Jerry makes her debut by showing us a quick look at exponents.

**Duration:** 00:00:59 / **Uploaded:** 2009-01-10 00:00:00

**Description:**

Student, Alice, shows us how to solve a 2-step equation AND how to check it.

**Duration:** 00:02:58 / **Uploaded:** 2010-10-09 00:00:00

**Description:**

Phinease shows us a quick way to remember how to convert percents to fractions.

**Duration:** 00:01:14 / **Uploaded:** 2010-11-11 00:00:00

**Description:**

Middle school student created this Mathtrain.com Promo. She made it up on the spot, using start and stop action. Then it was edited a bit to flow smoother.

**Duration:** 00:00:57 / **Uploaded:** 2008-03-26 00:00:00

**Description:**

Quick look at adding and subtracting integers.

**Duration:** 00:02:24 / **Uploaded:** 2008-10-12 00:00:00

**Description:**

Gary makes her debut. She shows us how to solve algebraic equations.

**Duration:** 00:01:46 / **Uploaded:** 2008-10-24 00:00:00

**Description:**

Tallua makes her debut! She shows us how to subtract a mixed number from a whole number.

**Duration:** 00:01:54 / **Uploaded:** 2009-01-23 00:00:00

**Description:**

"Justin", a 6th grader, makes her debut and shows us how to estimate fractions when multiplying (and dividing).

**Duration:** 00:02:05 / **Uploaded:** 2012-12-16 00:00:00

**Description:**

This tutorial was created by my students (with Christopher and Hunter) to help kindergarten students understand subtraction.

**Duration:** 00:01:48 / **Uploaded:** 2012-08-07 00:00:00

**Description:**

6th grader, Isabella, shows us how to evaluate an algebraic expression.

**Duration:** 00:01:09 / **Uploaded:** 2008-11-25 00:00:00

**Description:**

The debut video of sixth-grader, "Fernando", where he explains how to find the volume of a rectangular prism.

**Duration:** 00:02:04 / **Uploaded:** 2008-04-22 00:00:00

**Description:**

Find The GCF tutorial

**Duration:** 00:00:02 / **Uploaded:** 2009-04-21 00:00:00

**Description:**

Emilia & Kendall explain how to add 4/5ths and 3/7ths.

**Duration:** 00:01:34 / **Uploaded:** 2014-01-15 17:17:12

**Description:**

Jack, a 6th grader at Lincoln Middle School, shows us how to convert a fraction into a decimal.

**Duration:** 00:00:55 / **Uploaded:** 2009-01-04 00:00:00

**Description:**

We take a visual look at the area of a circle.

**Duration:** 00:02:25 / **Uploaded:** 2014-04-08 05:14:25

**Description:**

How to find the area of a composite figure.

**Duration:** 00:02:59 / **Uploaded:** 2010-05-12 00:00:00

**Description:**

Poseidon shows us some statistics: Mean, Median, Mode and Range.

**Duration:** 00:05:24 / **Uploaded:** 2013-06-08 03:43:08

**Description:**

Algebra-student, "Lucy", shows us how to find the equation of a line given two points. She uses y=mx+b.

**Duration:** 00:02:48 / **Uploaded:** 2008-03-26 00:00:00

**Description:**

"Larry", a sixth-grade student, shows us how to divide decimals.

**Duration:** 00:00:59 / **Uploaded:** 2008-03-31 00:00:00

**Description:**

Kat show us another way to remember how to divide fractions.

**Duration:** 00:00:58 / **Uploaded:** 2010-11-07 00:00:00

**Description:**

Middle school student Shane shows us a Simple Interest problem. She created this tutorial using ScreenChomp on her iPad and Camtasia Studio was later used for adding the pop ups.

**Duration:** 00:02:27 / **Uploaded:** 2014-01-20 21:15:38

**Description:**

8th grader, "Penelope", shows us how to simplify a complex rational expression problem.

**Duration:** 00:01:42 / **Uploaded:** 2008-03-26 00:00:00

**Description:**

Bob created this and edited it herself. She talks about Mathtrain.com. Mathtrain.TV was still sort of new back when this was recorded.

**Duration:** 00:01:09 / **Uploaded:** 2009-01-26 00:00:00

**Description:**

Early screencast from Mr. Marcos. This was originally recorded to help students on the homework on night. It was originally posted on Mathtrain.com.

**Duration:** 00:02:33 / **Uploaded:** 2008-04-06 00:00:00

**Description:**

Middle school student, "Shane", shows how to find the circumference of a circle. Part of the Mathtrain.TV "kids teaching kids" project from Eric Marcos and his Students at Lincoln Middle School, in Santa Monica, CA. (music score written and performed by E. Marcos)

**Duration:** 00:01:46 / **Uploaded:** 2013-11-17 21:16:48

**Description:**

Sasha shows us how to solve a percent problem by using a proportion.

**Duration:** 00:00:58 / **Uploaded:** 2010-02-28 00:00:00

**Description:**

Ethan and Tarun are going to show you how to add with decimals. Enjoy!

**Duration:** 00:01:09 / **Uploaded:** 2012-08-31 00:00:00

**Description:**

Corey shows us how he finds the GCD.

**Duration:** 00:01:10 / **Uploaded:** 2008-11-30 00:00:00

**Description:**

This video was made by request of a viewer. It is a followup to our other videos on integers.

**Duration:** 00:01:58 / **Uploaded:** 2009-05-24 00:00:00

**Description:**

"Betty" debuts with her tutorial. She takes the word problem, translates it into algebra, and then solves it. There are variables on both sides of the equation.

**Duration:** 00:01:37 / **Uploaded:** 2011-10-28 00:00:00

**Description:**

The new school year is under way and 6th graders, "Swifty" "Patrick" have created their 1st video. It is a quick look at evaluating algebraic expressions.

**Duration:** 00:01:23 / **Uploaded:** 2011-09-24 00:00:00

**Description:**

Debut screencast from 6th grader, "Pixie", of Lincoln Middle School, in Santa Monica, CA! "Pixie" shows us how to find the area of a trapezoid.

**Duration:** 00:02:24 / **Uploaded:** 2012-04-24 00:00:00

**Description:**

Kat, now a 7th Grader, returns to show us something she recently learned... Reflections.

**Duration:** 00:01:36 / **Uploaded:** 2011-05-11 00:00:00

**Description:**

Fractions! This is the story of Rob and the MegaHunk Chocolate Bar he ate. But he did not eat the whole thing. And he did not even start off with an entire bar. See how to solve this several ways, including visually. This problem was adapted from my former colleague, Dr. Marcy, and his Marcyworks.

**Duration:** 00:03:59 / **Uploaded:** 2010-11-09 00:00:00

**Description:**

Bob, and sort of Paul, talk about adding integers.

**Duration:** 00:01:57 / **Uploaded:** 2009-02-22 00:00:00

**Description:**

Student using MakeyMakey, creates a paper piano.

**Duration:** 00:01:52 / **Uploaded:** 2012-09-21 00:00:00

**Description:**

I just got my 3D Webcam and made this video. I have not finished reading the manual, but I decided to create The World's First Mathcast! You need 3D glasses to view the 3D effects.

**Duration:** 00:01:25 / **Uploaded:** 2009-03-04 00:00:00

**Description:**

This was our 2nd student-created video we aired. Billy Billy created it in 2007. We added some music to this release.

**Duration:** 00:02:31 / **Uploaded:** 2011-02-26 00:00:00

**Description:**

7th grader, "Rebecca", shows us fraction busters.

**Duration:** 00:02:32 / **Uploaded:** 2011-11-26 00:00:00

**Description:**

Bob solves an equation with integers.

**Duration:** 00:01:25 / **Uploaded:** 2008-10-14 00:00:00

**Description:**

Phinease gives us a quick look at absolute value. CCSS.Math.Content.6.NS.C.7

**Duration:** 00:00:59 / **Uploaded:** 2010-10-15 00:00:00

**Description:**

Here, sixth-grader, "Loielo", makes her debut mathcast. She shows us how to find the area of a triangle.

**Duration:** 00:01:14 / **Uploaded:** 2008-04-05 00:00:00

**Description:**

lines of symmetry AHST student submission!

**Duration:** 00:01:51 / **Uploaded:** 2010-04-21 00:00:00

**Description:**

Student "Phinease" takes a break from presenting at the ISTE Conference 2011 in Philadelphia, PA to talk about Mathtrain.TV. [special permission was granted from my student's family to create this interview]

**Duration:** 00:03:44 / **Uploaded:** 2013-02-13 00:46:46

**Description:**

Sixth-grader, Ralph, makes her debut by showing us how to find the mean.

**Duration:** 00:01:21 / **Uploaded:** 2008-06-20 00:00:00

**Description:**

This is our first student-created video from 2007. In 2006, I made some tutorials for the students. But this one marks the debut of 6th grader "Bob". 7.RP.

**Duration:** 00:03:18 / **Uploaded:** 2009-06-20 00:00:00

**Description:**

This was a homework problem an algebra student had on completing the square.

**Duration:** 00:03:59 / **Uploaded:** 2012-03-24 00:00:00

**Description:**

"Billy Billy" helped create this video using the free application, Edusim. She made it in December 2007. http://edusim3d.com/

**Duration:** 00:00:28 / **Uploaded:** 2010-08-31 00:00:00

**Description:**

"Rachel" makes her debut. The 7th grade student shows us how to solve and check a multi-step equation.

**Duration:** 00:01:56 / **Uploaded:** 2011-10-09 00:00:00

**Description:**

Jerry shows us how to find percents using proportion.

**Duration:** 00:01:03 / **Uploaded:** 2009-02-19 00:00:00