Question

Which doubles fact helps you solve 8+7=15? Write the number sentence.

Answer 1

8 + 8 = 16
16 - 1 = 15

or

7 + 7 = 14
14+1 = 15

Answer 2

Answer with explanation:

There are following double facts

When a Number is added to itself the result is twice of that number.

 1+1=2 ×1=2

 2+2=2×2=4

  3 +3=2×3=6

4+4=2×4=8

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Number 15 can be written in two ways

15=14+1-----(1)

    =16-1------(2)

So, the double fact that we can use to solve , 8+7=15 are

1.→ 8+7

    =14+1

     =7+7+1

   =(7+7)+1

2. →8+7

  =15-1

=(8+8)-1