case.
se 3
1. Write the first 10 multiples of 8 and 10. Find their first 3 common multiples.
2. Find the first 3 common multiples by the short method. Write the LCM in each
[Find the least common multiple.first.)
5 and 6
b b 9 and 12
2 and 5
d
3 and 4
4 and 6
5 and 10
3. Given below are the multiplication tables of 13, 14 and 15. Can you locate them
and write them in your class notebooks?
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Answers
1: multiple of 10=10 20 30 40 50 60 70 80 90 100
2: For two integers a and b, denoted LCM(a,b), the LCM is the smallest positive integer that is evenly divisible by both a and b. For example, LCM(2,3) = 6 and LCM(6,10) = 30. The LCM of two or more numbers is the smallest number that is evenly divisible by all numbers in the set.
a To sum up, the lcm of 5 and 6 is 30. In common notation: lcm (5,6) = 30.
b 36
c 10
3:
Factors Multiples
1 1 2 3 4 5 6 7 8 9 10
1, 2 2 4 6 8 10 12 14 16 18 20
1, 3 3 6 9 12 15 18 21 24 27 30
1, 2, 4 4 8 12 16 20 24 28 32 36 40
1, 5 5 10 15 20 25 30 35 40 45 50
1, 2, 3, 6 6 12 18 24 30 36 42 48 54 60
1, 7 7 14 21 28 35 42 49 56 63 70
1, 2, 4, 8 8 16 24 32 40 48 56 64 72 80
1, 3, 9 9 18 27 36 45 54 63 72 81 90
1, 2, 5, 10 10 20 30 40 50 60 70 80 90 100
1, 11 11 22 33 44 55 66 77 88 99 110
1, 2, 3, 4, 6, 12 12 24 36 48 60 72 84 96 108 120
1, 13 13 26 39 52 65 78 91 104 117 130
1, 2, 7, 14 14 28 42 56 70 84 98 112 126 140
1, 3, 5, 15 15 30 45 60 75 90 105 120 135 150