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Counting down from 10

Knowing how to count up and down from 1 to 10 will help you find one more or one less of numbers between 1 and 100.

Watch: Count down from 10

Add one or subtract one

To work out which number is one more than a number, you need to add one. For example,

45 + 1 = 46

46 is one more than 45.

To work out which number is one less than a number, you need to subtract one. For example,

45 - 1 = 44

44 is one less than 45.

Activity 1

Look at the number square below. Move your finger up and down the numbers on the number square to find one more and one less than:

15, 37, 42, 11, 53, 29 and 67.

Activity 2

Click the activity below and type in the numbers. Can you get full marks?