lia74
lia74 lia74
  • 24-09-2018
  • Mathematics
contestada

Is 2.1 x 4.9 x 7.2 = 105.84 a reasonable estimate

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sqdancefan
sqdancefan sqdancefan
  • 26-09-2018

No.

You'd estimate this as 2 × 5 × 7.2 = 72.

You only keep the decimal place in 7.2 because the othe factor is 10 and it helps reduce the error.

_____

The actual value is 2.1 × 4.9 × 7.2 = 74.088, nowhere close to 106.

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