Remember: The greatest common factor is the biggest number that goes into both. The least common multiple is the first number both lists reach.
Factors, multiples and sharing
1
Sensei packs 6 red counters and 10 blue counters into matching bags. Every bag has the same mix and nothing is left over. What is the most bags?
2
The lists show every factor of 15 and of 24. What is the greatest common factor of 15 and 24?
3
Circle every common factor of 12 and 18.
24693
4
The lists show the first multiples of 4 and of 6. What is the least common multiple of 4 and 6?
5
What is the least common multiple of 5 and 8?
6
The least common multiple of 3 and 4 is 7.
TrueFalse
7
What is the greatest common factor of 27 and 60?
931
8
16 + 20 = 4 × ( + 5)
9
40 + 72 = × (5 + 9)
10
Join each pair of numbers to its greatest common factor.
16 and 9
28 and 12
310 and 25
414 and 21
A5
B3
C7
D4
11
Join each pair of numbers to its least common multiple.
12 and 3
24 and 10
36 and 8
45 and 15
A6
B15
C20
D24
12
Pens come in packs of 4 and erasers come in packs of 6. What is the fewest pens that gives the same number of pens and erasers?
241012
13
18 + 27 = 9 × ( + 3)
14
Pip says the greatest common factor of 12 and 18 is 1, because 1 goes into both. Write what is wrong.
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