Worksheet: Addition Strategies for Sums to 20: Doubles Minus One

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In this worksheet, we will practice using facts about doubles to add two consecutive numbers whose sum is within 20.

Q1:

Which expression is equal to 6 + 5?

  • A 1 2 + 1
  • B 6 + 5 + 1
  • C 5 + 4 − 1
  • D 1 2 + 5
  • E 1 2 − 1

Q2:

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 4 + 4
  • B 4 + 8
  • C 8 − 1

Q3:

Use

to find

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