Example 1.52 from Prealgebra, 1.4 Multiply Whole Numbers

Multiply Whole Numbers: example 1.52

Humberto bought $4$ sheets of stamps. Each sheet had $20$ stamps. How many stamps did Humberto buy?

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution
We are asked to find the total number of stamps.

Write a phrase for the total. the product of 4 and 20

Translate to math notation. $4 \cdot 20$

Multiply.

Write a sentence to answer the question. Humberto bought 80 stamps.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Valia donated water for the snack bar at her son’s baseball game. She brought $6$ cases of water bottles. Each case had $24$ water bottles. How many water bottles did Valia donate?

How did it go?

Write a phrase for the total.	the product of 4 and 20
Translate to math notation.	$4 \cdot 20$
Multiply.
Write a sentence to answer the question.	Humberto bought 80 stamps.

Solution

Your turn

Solution

Your turn