Question

Estimate an approximate value of 103 x 51 by rounding off each number to the nearest ten .

Answer 1

103 is rounded off to nearest ten gives 100 as ones digit 3 is less than 5.

51 is rounded off to nearest ten gives 50 as ones digit 1 is less than 5.

Now, $100\times 50=5000$

Hence, an estimation of the approximate value of $103\times 51$ will be 5000.