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Adjust the estimated quotient if needed. Then divide. a 3116 + 45 b 389 + 19 c 566 +29 e 7137 + 38 f 6680 + 81 g 711 +81 |
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Answer» (i) Divide 84 by 21 Round the number to the nearest ten 84 ÷ 21 → 80 ÷ 20 Calculate mentally. 8 ÷ 2 = 4 Estimated quotient = 4 (ii) 242 ÷ 22 Round to the nearest ten 240 ÷ 20 Calculate mentally 24 ÷ 2 = 12 Estimated quotient = 12 In the process of division, the estimation of the quotient PLAYS a great role in its solution. Let us see this in the following questions on division. 1. 74 ÷ 35 2. 627 ÷ 23 3. 694 ÷ 56 4. 975 ÷ 48 1. 74 ÷ 35 is approximately the same as 70 ÷ 40, i.e., 7 ÷ 4 (74 → 70 & 35 → 40) 7 ÷ 4 is approximately 2. So,the estimated quotient is 2. 2. 627 ÷ 23 is approximately the same as 600 ÷ 20 = 60 ÷ 2 = 30 (627 → 600 & 23 → 20) So, the estimated quotient is 30. 3. 694 ÷ 56 is approximately the same as 700 ÷ 60 or 70 ÷ 6 70 ÷ 6 is approximately = 12. So, the estimated quotient =12 4. 975 ÷ 48 is approximately 1000 ÷ 50 = 100 ÷ 5 = 20 So, estimated quotient = 20 |
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