The value of 13.7 × 12.7 × 0.8 is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 139.192
Multiply the numbers as whole numbers, then place the decimal point: the product has as many decimal places as all the factors together, here \(1+1+1=3\).
\(137\times127=17399\)
\(17399\times8=139192\)
With 3 decimal places: 139.192
Shortcut: Estimate first: \(13.7\times12.7\) is about \(14\times12.5=175\), and \(175\times0.8=140\). Only Options (3) and (4) are near 140, and the last digit of \(7\times7\times8=392\) is 2, which picks 139.192.