An ancient story revisited

I think many of you will be interested in this video story!

It is an ancient story that was originally told almost 2000 years ago... Since that time, and even in today's modern world, many people have used the basic theme of that story as a basis for their own stories.

It is presented in a fascinating multi-media presentation form. Click the picture above to view the video!

How to talk math with your kids - video

Kent Haines is both a math teacher and a dad. In this video, he shares some excellent tips on how to help your children's "math-readiness", expressing it with a modern term. Or we might just say, how to help your children understand their world with math. It's aimed at parents of little children but the ideas ring true for other ages too:

The three important guidelines he shares are:

1. Use math language.
2. Play.
3. Focus on questions, not on answers.

I enjoyed the video!

Word problems involving "four times as many as"

Someone asked for help to explain the concepts of multiplicative word problems involving "as many as", like the ones below:

1) Haley had four times as many dollars as her sister. Together they had $60. How much money does Haley have?

2) Rachel had 5 times as many dollars as her sister, Nora. They had a total of $90. How much money did each of them have?

The BAR MODEL is an excellent tool for helping children understand what is going on in these types of word problems.

In (1), draw a bar for Haley and another for her sister. Divide Haley's bar into four parts, and make the other bar just one such part long.

Haley |---|---|---|---|

Sister |---|

Now you will see that the TOTAL needs divided into FIVE equal parts — and from then on it is easy-peasy.

Additionally, you can use Thinking Blocks website to build such bar models INTERACTIVELY.

For problems like (1) and (2) above, choose the fourth model from the left (rightmost) in the top row that is bluish in color. Then click &qu…

Flash sale for Math Mammoth

Homeschool Buyers Co-op is running a FLASH SALE for the large Math Mammoth bundles — get them at 40% off! This sale ends on July 17, 2017.

Graph paper, and those who don't love math

If you have a few minutes, check out

It's an interesting and encouraging read. Thoughts about technology (no need for it at every turn), and how to teach those who don't love math, and how just a piece of graph paper can lend itself to a powerful learning tool...!

What age do YOU think is old?

I just saw this in the IntMath Newsletter I subscribe to...

Here's an age equation that's pretty accurate:

OldAge = 10 * √NowAge

When you're 16, old people are 40. When you're 50, old people are 70, and when you're 100, you know you're old!

Hat Tip to Murray from

A five-year old GOT the connection between addition and subtraction

I just got this in from a customer... how PRECIOUS!

Lydia, who is not yet five years old, has just started the subtraction section of Math Mammoth 1A. She made an amazing discovery and wanted to tell you about it. A photo of her letter is attached, which a translation here.

"Dear Math People,
I found out
When you do a subtraction
It's adding
Did you know about that?


Lydia's mom also said that she feels Lydia is going to be so amazed when the workbook points this out a few pages from now!

Multiplication algorithm and lattice multiplication

This is a GOOD comparison between the standard multiplication algorithm and lattice multiplication!

The author even brings in the area model for multiplying multi-digit numbers (which I also show in Math Mammoth). The area model is of course only used to show students what is going on, based on place value -- not to replace any algorithm.

In our desire for "efficiency," we lose transparency in the standard "long multiplication" algorithm. Read it at