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唉` F.2 MatHs''2條 好eaSy' 真的.___.

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如題;]` 唔該d有心人救下我-v-圖片參考：http://tw.yimg.com/i/tw/ugc/rte/smiley_5.gif1a) Jane invited some fds to her hm for a birthday party. There are12 cans of soft drink in the refrigerator. If everyine drinks approxmately 1 1/4 cans of soft drink, estimate how many persons can be served..1b) Six packets of ice tea cost... 顯示更多 如題;]` 唔該d有心人救下我-v- 圖片參考：http://tw.yimg.com/i/tw/ugc/rte/smiley_5.gif 1a) Jane invited some fds to her hm for a birthday party. There are12 cans of soft drink in the refrigerator. If everyine drinks approxmately 1 1/4 cans of soft drink, estimate how many persons can be served.. 1b) Six packets of ice tea cost $11.9. If Robert wants to buy 70 packets, estimate the total cost.. Estimate the value of each of the following and state the estimation strategy used. 2a) 29+33+31+56+47+45+62+58+61+77 2b) 1047.2 x 6.94 4.98

最佳解答:

1a) Everyone drinks approx.1 1/4 cans or 1.25 cans. For estimation, we take 1.2 cans per person. Therefore, we estimate 12 cans can serve 12/1.2 or 10 persons. 1b) 6 packets costs $11.9. For estimation, we take $12.0 for 6 packets. That is $12/6 or $2 per packet. We estimate 70 packets will cost 70x$2 or $140 in total. 2a) Estimation strategy: For unit place =5,6,7,8,9, we round it up to 10. For unit place =1,2,3,4,5, we round it down to 0. Therefore, 29+33+31+56+47+45+62+58+61+77 =30+30+30+60+50+50+60+60+60+80 =510 2b) Estimation strategy: We round the decimal numbers to integers for easy multiplication. For numbers >1000. we will round to the tenth place. Therefore, 1047.2 x 6.94 x 4.98 =1050 x 7 x 5 =7350 x 5 =36750

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