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標題:

急~中一math~20點

發問:

Estimate the results of the following(each number correct to the nearest integer)1a) 1.29+5.78+0.96+2.12(rounding off)1b) 5.92x31(rounding down)1c)2.16+3.721.83+4.32(rounding up)1d)28x4.21(rounding off)Estimate the results of the following by front-end... 顯示更多 Estimate the results of the following(each number correct to the nearest integer) 1a) 1.29+5.78+0.96+2.12(rounding off) 1b) 5.92x31(rounding down) 1c)2.16+3.721.83+4.32(rounding up) 1d)28x4.21(rounding off) Estimate the results of the following by front-end method 2a)2.12+6.65+1.97+3.38+1.83 2b)1326+4158+668+3824 2c)4.68+0.98+1.21+2.36+3.82 2d)228+347+158+73 ps.要有steps 唔該~~

最佳解答:

1a) 1.29+5.78+0.96+2.12(rounding off) =1+6+1+1+2 =11 1b) 5.92x31(rounding down) =6x31 =186 1c)2.16+ ?(3.721.83)? +4.32(rounding up) 1d)28x4.21(rounding off) =28x4 =108 2a)2.12+6.65+1.97+3.38+1.83 =2+7+2+3+2 =16 2b)1326+4158+668+3824 =1000+4000+700+4000 =9700 2c)4.68+0.98+1.21+2.36+3.82 =5+1+1+2+4 =13 2d)228+347+158+73 =200+300+200+100 =800

其他解答:

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