USING VENN DIAGRAMS TO FIND CHF AND LCM WORKSHEET
Find the highest common factor (HCF) of each pair of numbers.
Problem 1 :
21 and 49
Problem 2 :
35 and 45
Problem 3 :
18 and 24
Problem 4 :
18 and 45
Problem 5 :
30 and 75
Problem 6 :
28 and 42
Problem 7 :
60 and 90
Problem 8 :
48 and 64
Find the lowest common multiple (LCM) of each pair of numbers.
Problem 9 :
15 and 35
Problem 10 :
14 and 22
Problem 11 :
15 and 21
Problem 12 :
9 and 33
Problem 13 :
12 and 15
Problem 14 :
18 and 30
Problem 15 :
16 and 20
Problem 16 :
24 and 30
Answer Key
1) the HCF of 21 and 49 is 7.
2) the HCF of 35 and 45 is 5.
3) the HCF of 18 and 24 is 6
4) the HCF of 18 and 45 is 9.
5) the HCF of 30 and 75 is 15
6) the HCF of 28 and 42 is 14
7) the HCF of 60 and 90 is 30
8) the HCF of 48 and 64 is 16
9) the LCM of 15 and 35 is 105.
10) the LCM of 14 and 22 is 154
11) the LCM of 15 and 21 is 105
12) the LCM of 9 and 33 is 99.
13) the LCM of 12 and 15 is 60
14) the LCM of 18 and 30 is 90.
15) the LCM of 16 and 20 is 80
16) the LCM of 24 and 30 is 120.
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