Before proceeding to the solution of examples and problems be sure to read the theoretical part of the lesson
Lowest common multiple
1. Copy and draw a circle around the numbers which are not multiples of
9,
36, 22, 38, 91.
а) 36, 38, 91;
b) 9, 38, 91;
c) 22, 38, 91;
d) 22, 22, 91.
2. Copy and draw a circle around the
numbers which are not multiples of
6,
23, 18, 54, 42.
а) 18; b) 23;
c) 54; d)
42.
3. Here are the first six multiples of 6
and 10
6: 6, 12, 18, 24, 30, 36.
10: 10, 20, 30, 40, 50, 60.
Write down the Least Common Multiple (LCM)
of 6 and 10 (is the lowest number which is in both lists).
а) 18; b)
12;
c) 40; d) 30.
4. Copy and complete the first five
multiples of 4 and 6
4: 4, 8, _, _, _.
6: 6, _,
_, _, _.
Write down the LCM of
4 and 6.
а) 12,
16, 20; 12,
18, 24, 30. LCM12;
b) 12, 18, 20;
12, 18, 24,
30. LCM12;
c) 12,
16, 20; 12, 16, 24,
30. LCM12;
d) 12,
16, 20; 12,
18, 24, 30. LCM24.
5. Find the Least Common Multiple of
each of these pairs of numbers
3 and 10
а) 10; b) 30;
c) 60; d)
3.
6. Find the Least Common Multiple of each of these pairs of numbers
3 and 7
а) 7; b)
3;
c) 21;
d) 63.
7. Find the Least Common Multiple of each of these pairs
of numbers
5 and 9
а) 9; b)
90;
c) 5; d) 45.
8. Find the Least Common Multiple of each of
these pairs of numbers
10 and 7
а) 140; b)
7;
c) 70;
d) 10.
9. Find the Least Common Multiple of each of
these pairs of numbers
3 and 6
а) 6;
b) 0;
c) 12; d)
3.
10. Find the Least
Common Multiple of each of these pairs of numbers
8 and 20
а) 20; b) 40;
c) 60; d)
80.
11. Find the Least
Common Multiple of each of these pairs of numbers
12 and 15
а) 36; b)
120;
c) 45; d) 60.
12. Find the Least
Common Multiple of each of these pairs of numbers
12 and 20
а) 36; b)
80;
c) 60;
d) 120.
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