Directions (Set of 5 questions): What approximate value should come in place of the question marks(?) in the following questions? (Note : you are not expected to calculate the exact value.)
$5\frac{3}{8}~\times 1056+161.81~\times 124.14=~?~-~{{31.12}^{2}}$
Solution
$5\frac{3}{8}~\times 1056+161.81~\times 124.14=~?~-~{{31.12}^{2}}$
$?~-{{31}^{2}}~\approx \frac{43}{8}~\times 1056+162~\times 124$
$?~-961~\approx 132\times 43+20088$
$?=20088+961+5676$
$?=26725$