### Home > ACC7 > Chapter 7 Unit 8 > Lesson CC3: 7.2.5 > Problem7-84

7-84.

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

1. What are the product and sum of $2.4$ and $1.5$?

1. $?(0.6)=4.2$

1. $3.1+?=11.1$

1. Which two numbers have a product of $-49$ and a sum of $0$?

Since the sum is $0$, one number must be negative and one must be positive, but both numbers must have the same magnitude.