Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 89.

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asked Jan 17, 2021 51.3k views

2 Answers

Gpanterov · Answer 1 · 2021-01-21T21:07:38+0000

She can use this double by first finding the different in between 70 and 89, which is 19. After finding that difference she should add 19 to the result of the double.

Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 89.

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