Worksheet: Doubles Minus One

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


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?

  • A 8 1
  • B 4 + 8
  • C 4 + 4



to find


Emma 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.


Michael was asked to solve 6+5.

He wrote

Is his solution correct?

  • Ayes
  • Bno

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