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2013-07-18 11:02 pm

Find the HCF of each of the following groups of numbers.
(a)12,15
1.factors of 12:__________________
2.factors of 15:__________________
3.Common factors of 12 and 15:_____________________
4.HCF of 12 and 15:_____________
(b)45.105
1.factors of 45 are 1,____,____,____,____
2.factors of 105 are 1,____,____,____,____
3.Common factors of 45 and 105 are 1,____,____
4.HCF of 45 and 105 is___________
(c)8,12,30
1.factors of 8 are_________________
2.factors of 12 are________________
3.factors of 30 are________________
4.HCF of 8,12 and 30 is____________

回答 (1)

2013-07-18 11:20 pm

✔ 最佳答案

(a)12,15
1.factors of 12: 1,2,3,4,6,12
2.factors of 15: 1,3,5,15
3.Common factors of 12 and 15: 1,3
4.HCF of 12 and 15: 3

(b)45,105
1.factors of 45 are 1,3,5,9,15,45
2.factors of 105 are 1,3,5,7,15,21,35,105
3.Common factors of 45 and 105 are 1,3,5,15
4.HCF of 45 and 105 is 15

(c)8,12,30
1.factors of 8 are 1,2,4,8
2.factors of 12 are 1,2,3,4,6,12
3.factors of 30 are 1,2,3,5,6,10,15,30
4.HCF of 8,12 and 30 is 2

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