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Jack broke apart 5x216 as (5x200)+(5x16) to multiply mentally. What strategy did Jack use?

User Dansimau
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2 Answers

4 votes

The correct answer is:

He used the distributive property.

Step-by-step explanation:

To rewrite a product using the distributive property, break one of the numbers up into two smaller, easier to multiply numbers. In this problem, Jack broke 216 into (200+16). He then multiplied by 5:

5(200+16)

Using the distributive property, we multiply the number outside by both factors inside:

5(200) + 5(16) = 1000+80 = 1080

This makes the number easier to multiply quickly.

User Thokchom
by
7.6k points
1 vote

For this case we have the following multiplication:


image

We can rewrite this multiplication in the following way:


image

From here, we apply the distributive property.

We have then:


image

Therefore, Jack's strategy is:

Write the number in an expanded form and then apply the distributive property.

Answer:

Jack's strategy is:

Write the number in an expanded form and then apply the distributive property.

User Piotr Badura
by
7.9k points
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