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Activity 2

Find 10 more and 10 less than any 2-digit number

 

Choose a 2 digit number eg. 25

Using the 100 square, encourage your child to put their finger on the starting number and to jump to the square directly below for 10 more and to jump to the square directly above for 10 less. Repeat with other 2 digit number. 

Discuss how the 10s have changed but the  1s remain the same.

 

Make the link between more and adding, and less and subtracting.

e.g.

10 more than 65 is 75

65 + 10 = 75

 

10 less than 51 is 41

51 - 10 = 41

 

Write out some 10 more (+10) and 10 less (-10) number questions for your child to answer. 

100 Square

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