jerragroce jerragroce

23-08-2017
Mathematics

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What is the best estimate for the product of 289 and 7

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latashacmoore latashacmoore

23-08-2017

I would estimate it as (300 x 7) = 2100

Then I would subtract (11 x 7) + 77 from that to get the exact answer of 2023

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I didn't use a calculator or paper. The 'trick' is to notice that 289 = (300 - 11)

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