What is a 100 square? A 100 square shows the numbers 1 to 100 on a grid. Each row has 10 numbers on it. At the end of each row is a multiple of ten. You can use the 100 square to count from 1 to 100 ...

Today we learned about square and rectangular numbers! But why do we call some numbers square and others rectangular? A number is considered a square or rectangular number based on the shape it makes!