04-09-2017
Mathematics

contestada

Erica used friendly numbers to find 43-19. She added 1 to 19 and subtracted 1 from 43. What is Erica's error?

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Topmadworld Topmadworld

04-09-2017

I think that it is....
42-20=22

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Аноним Аноним

04-09-2017

She could have added 1 to 19 to give 20 then subtracted this from 43 to give 23. Then she can add the 1 to 23 to get the correct answer which is 24.

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