Round 498.32 to nearest 100:
498.32 ~= 500
Round 10.53 to nearest 10:
10.53 ~= 10
So 498.53 x 10.53 ~= 500 x 10
= 5000
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It is 5 + 4 = 9.
Front end rounding is taking the first digit and making the rest 0. 75 would be 70 in front end rounding.
Front end rounding is using the first or the first two digits to make an estimation. 37145 would be rounded to 40000.
90
398.22 * 93.87 = 398 * 94 = (400 - 2)*(90 + 4) = 36000 + 1600 - 180 - 8 = 37,412 The exact answer, using a calculator, is 37380.9114. So the estimate is too large by 0.08%