Example 1.53 from Prealgebra, 1.4 Multiply Whole Numbers

Multiply Whole Numbers: example 1.53

When Rena cooks rice, she uses twice as much water as rice. How much water does she need to cook $4$ cups of rice?

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 how much water Rena needs.

Write as a phrase. twice as much as 4 cups

Translate to math notation. $2 \cdot 4$

Multiply to simplify. 8

Write a sentence to answer the question. Rena needs 8 cups of water for cups of rice.

Your turn

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

Erin is planning her flower garden. She wants to plant twice as many dahlias as sunflowers. If she plants 14 sunflowers, how many dahlias does she need?

How did it go?

Write as a phrase.	twice as much as 4 cups
Translate to math notation.	$2 \cdot 4$
Multiply to simplify.	8
Write a sentence to answer the question.	Rena needs 8 cups of water for cups of rice.

Solution

Your turn

Solution

Your turn