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Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 80.
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2 votes
Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 80.

User Anton Geraschenko
by
4.9k points

2 Answers

3 votes

Answer:

you would just add 10 to 140

User Mdogan
by
5.0k points
1 vote

Answer:

see below

Explanation:

70 + 70 = 140.

We know that 80 is 10 more than 70

the answer to 70+80 must be 10 more than the answer to 70+70 =140

so 140+10 = 150

User Yash Nag
by
5.2k points
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