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有關maths的問題(5分)2
發問:
2. (a) Try to use the following methods of estimation to round the numbers in the expression 235 x 52 correct to the nearest ten. Then find the estimated value of the expression. (i) Round off (ii) Round up (iii) Round down (b) David wants to fill 52 cups with soft drink and each cup holds 235... 顯示更多 2. (a) Try to use the following methods of estimation to round the numbers in the expression 235 x 52 correct to the nearest ten. Then find the estimated value of the expression. (i) Round off (ii) Round up (iii) Round down (b) David wants to fill 52 cups with soft drink and each cup holds 235 ml of liquid. Pick one of the methods of estimation mentioned in (a) above to find out how many 1L bottled soft drink should be bought to fill all the cups.
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2ai) Round off 235 x 52 ≒ 240 x 50 = 12000 ii) Round up 235 x 52 ≒ 240 x 60 = 14400 iii) Round down 235 x 52 ≒ 230 x 50 = 11500 b) 1L = 1000ml To choose the best method, first consider the actual volume of the soft drink, which is 52 x 235 ml = 12220 ml Then calculate the difference between the estimated values in a) For ai) 12220 - 12000 = 220ml aii) 14400 - 12220 = 2180ml aiii) 12220 - 11500 = 720ml So, the method of rounding off is the most accurate. Hence the number of 1L bottled soft drink that should be bought: 12000 / 1000 = 12
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