### Home > CCAA8 > Chapter 1 Unit 1 > Lesson CCA: 1.1.2 > Problem 1-21

1-21.

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

Multiply the contents of the left and right squares, and place the product in the top square.

The bottom square contains the sum of the contents of the left and right squares.