Answer :

8+7

=2(-1)+10+7

=-2+10+7

=8+7

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


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