Using a 100 square - KS1 Maths - Learning with BBC Bitesize

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 and to count from 100 to 1.

You can also use it to spot patterns in the numbers up to 100.

Complete this interactive activity to understand how to use a 100 square to count up and back. Then put your knowledge to the test.

A 100 square can help you count numbers from 1 to 100.

If it's useful, you can move your finger along each square as you count up or down.

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Count in ones
To count up in ones, you count on along the rows of the 100 square. Remember when you're counting on the 100 square, you do not count the number you start on. You start from the number next to it.
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Count past a multiple of ten
When you count past a multiple of ten, such as 50, 70 or 90, move your finger all the way to the start of the next row. When you count down past a multiple of ten move your finger all the way to the end of the row above.
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Count in tens
To count up in tens, count down the columns of the 100 square.
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Count in tens
Now try counting in tens from the number 13. Do you notice anything? Counting up in tens doesn’t change the last digit of the numbers. 23, 33, 43, 53, 63, 73, 83, 93.