Question

Estimate 49% of 162. Use mental math to calculate 49% of 162. ???

Answer 1

$if\ 50\%\ of\ 162\ is\ 81\ so\ 49\%\ of\ 162\ is\ about\ 79-80$

Answer 2

$49\%\approx50\%\\50\%=\frac{1}{2}\\\frac{1}{2}\cdot162=81\\49\%<50\%\\The\ answer\ is:\ Serched\ number\ is\ about\ 80.$