babiichloe babiichloe

14-02-2016
Mathematics

contestada

estimate product
126.12 and 2.2

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apologiabiology apologiabiology

14-02-2016

so estimate
round to whole numbers
126 times 2
we know that times 2 is just add them twice
126 times 2=126+126=252
aprox 252

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14-02-2016

I might round 126.12 UP to 130 and 2.2 DOWN to 2, then multiply 130 x 2 to get 260. This UNDER-estimates the true answer, 277.4, because rounding 126.12 up to 130 is only a slight increase percentage-wise (about 3%) whereas rounding 2.2 down to 2 is a greater decrease percentage-wise (10%).

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