Question

Use double minus one to solve 8+7 write the number sentence

Answer 1

8+7

=2(-1)+10+7

=-2+10+7

=8+7

Answer 2

Doubles Minus One

Use your doubles, and subtract one. Use the highest addend.

The given expression is;

8+7

Now the highest addend is "8".

Double the 8 and then minus 1.

8+8= 16

Now, 16 - 1 = 15