Worksheet: One More and One Less: Numbers up to 20

In this worksheet, we will practice finding one more or one less than numbers between 10 and 20 by using place value blocks to help us.

Q1:

What number is one less than 10+5?

Q2:

What number is one more than 10+7?

Q3:

Think about finding one more.

What is one more than 2?

What is one more than 12?

Q4:

Think about finding one less.

What is one less than 8?

What is one less than 18?

Q5:

Chloe has shown that 16 is 1 ten and 6 ones.

To find one more, she can add a one.

Fill in the blank: One more than 16 is 1 ten and ones.

Fill in the blank: One more than 16 is .

Q6:

Daniel has shown that 14 is 1 ten and 4 ones.

To find one less, he can take away a one.

Fill in the blank: One less than 14 is 1 ten and ones.

Fill in the blank: One less than 14 is .

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