Page 130 - Demo

Arrow-Puffin-3_Semester-1 Maths 129ESTIMATION OF DIFFERENCEYou have already learnt how to estimate a sum by rounding the addends.To estimate the difference between two numbers, we first round each number and then subtract the rounded numbers.The answer is not the exact difference, but is close to it.Example 1 : Estimate the difference of 57 and 12 to the nearest 10.So, the estimated difference of 57 and 12 is 50. And the actual difference is 45.T O6 0%u2014 1 05 0T O5 7%u2014 1 2 4 57. In a marriage party, a chef served a total of 2317 guests, of which 1783 guests were adults. How many children did the chef serve?8. A school library has 1805 Hindi books in a total of 2758 books. All the remaining books are English books. How many English books are there in the library?estimatedvalueLet's Understand Conceptual UnderstandingExample 2 : Estimate the difference of 375 and 192 to the nearest 100.H T O3 7 5%u20141 9 21 8 3H T O4 0 0%u20142 0 02 0 0estimatedvalueTherefore the estimated difference of 375 and 192 is 200.The actual difference is 183.