### Home > ACC7 > Chapter 2 Unit 1 > Lesson CC3: 2.1.9 > Problem2-87

2-87.

Copy and complete each of the Diamond Problems below. The pattern used in the Diamond Problems is shown at right.

1. Multiply $8$ by $−8$ to get $xy$.
$8(−8)=−64$

Add $8$ to $-8$ to get $x+y$.
$8+(−8)=0$

1. What are the factors of $−25$?

Which of these add to $0$?

1. Divide $−12$ by $4$ to find $y$.

1. Use the pattern in the diamond and remember your negative signs.