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~~
急~中一math~20點
2007-12-16 10:39 pm
回答 (2)
2007-12-16 11:06 pm
✔ 最佳答案
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
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https://hk.answers.yahoo.com/question/index?qid=20071216000051KK02039