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 ...

Addition involves finding the total of two or more numbers or amounts. There are different things you can use to help you add. You can use number lines, place value charts and place value counters.