Kevin wants to cut 250 circles with diameters of 3cm each from some drawing papers.Estimate whether 6 pieces of drawing papers with dimensions of 19cm x26 cm each are enough. Explain briefly.
點計?
呢課係Estimation & Approximation
F.2Maths一條問題10分
2011-11-20 11:43 pm
回答 (2)
2011-11-21 12:32 am
✔ 最佳答案
26/3=8...2
19/3
=6...1
the total no.of circles that can be cut
=8*6*6
=288
therefore,6 pieces of drawing papers with dimensions of 19cm x26 cm each are enough to cut 250 circles with diameters of 3cm each.
2011-11-21 1:20 am
The first set 6 drawing paper: 15 x 25 (rounded down to the nearest 5) multiplied by 6 (each paper)
= 2250 cm3 / /
3 x 3 (each circle a square set ring system) by 250
= 2250 cm3 / /
so is enough.
2011-11-20 17:22:52 補充：
The first set 6 drawing paper: 15 x 25 (rounded down to the nearest 5) multiplied by 6 (each paper)
= 2250cm3 / /
3 x 3 (set circles is square) x 250
= 2250cm3 / /
= 2250 cm3 / /
3 x 3 (each circle a square set ring system) by 250
= 2250 cm3 / /
so is enough.
2011-11-20 17:22:52 補充：
The first set 6 drawing paper: 15 x 25 (rounded down to the nearest 5) multiplied by 6 (each paper)
= 2250cm3 / /
3 x 3 (set circles is square) x 250
= 2250cm3 / /
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