Chapter 4.5, Problem 1P

Josh consistently remembers that $7\times 7=49$ , but he keeps forgetting $7\times 8$ .

a. Explain to Josh how $7\times 7$ and $7\times 8$ are related. Draw an array to help you show this relationship.

b. Write an equation relating $7\times 8$ to $7\times 7$ . Which property of arithmetic does your equation use? Explain.