why does the fact family for 81 and 9 have only two number sentences

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04-09-2017
Mathematics

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why does the fact family for 81 and 9 have only two number sentences

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sofiaanddaevion sofiaanddaevion · Answer 1 · 2017-09-04T19:17:52+02:00

sofiaanddaevion sofiaanddaevion

04-09-2017

Because there are only two things you can do with these two " family" members. 81 divided by 9 is 9. 9 times 9 is 81. Strictly speaking, there should be three in the family: 9,9 and 81 9 is the square root of 81. 81 is the 9 squared.

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