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

Q1:

Which expression is equal to 6 + 5?

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

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 + 8
  • B 4 + 4
  • C 8 1

Q3:

Use

to find