Video: Finding 10 Less Than a Given Number Using a Hundred Square

Use the hundred square to find 10 less than 70.

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Video Transcript

Use the hundred square to find 10 less than 70.

How do we use a hundred square to find 10 less? If we move one space below 70 on the hundred square, we would reach 80.

As we move down the hundred square, the numbers increase by 10: 70, 80, 90.

If we move up the hundred square, the numbers decrease by 10: 70, 60, 50, 40. So the number which is 10 less than 70 is 60.

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