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Square Grids Yield Square Number of Rectangles

Last week we explored the amazing pattern of squares withing square grids. The result is always a sum of square numbers such as 1 + 4 + 9 + 16 + 25 ... in a 5x5 grid.

How Many Squares Are in the Compound Drawing?

We explored  the dimensions of our mathematical world. We should not take for granted that children understand the classifications of mathematical dimensions.

Magic of Adding Numbers with Anti-Nines

Step 1: Have someone pick a large number with any number of digits.

Subtraction Magic of Nines — Longevity Calculator

Last week we explored the concept of difference by subtracting birth year from death year to calculate the longevity of scientists and mathematicians. The K-1st graders subtracted using standard algorithm with no borrowing and the older students mastered both borrowing and subtracting with adding.