Worksheet: Doubles Minus One

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In this worksheet, we will practice adding two consecutive numbers with sums up to 20 by finding one less than a doubles fact.

Q1:

Notice that 3 is one less than 4.

So the answer to 4+3 is one less than the answer to 4+4.

If 4+4=8, which of the following is equal to 4+3?

  • A8−1
  • B4+8
  • C4+4

Q2:

Use

to find

Q3:

Amelia tried to solve 9+8 by using the doubling numbers facts, but she got the answer wrong.

Her teacher circled the mistake in her answer. Help her by finding 9+8.

Q4:

Michael was asked to solve 6+5.

He wrote

Is his solution correct?

  • Ayes
  • Bno

Q5:

Given that 3+3=6, find 3+2.

Q6:

Complete the addition sentence.

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