Remember: The greatest common factor is the biggest number that goes into both. The least common multiple is the first number both lists reach.
Greatest common factor, least common multiple
1
Pip packs 8 stars and 12 hearts into matching gift bags. Every bag has the same mix and nothing is left over. What is the most bags?
2
The lists show every factor of 18 and of 30. What is the greatest common factor of 18 and 30?
3
Circle every common factor of 16 and 24.
24683
4
The lists show the first multiples of 6 and of 9. What is the least common multiple of 6 and 9?
5
What is the least common multiple of 6 and 10?
6
The least common multiple of 2 and 5 is 10.
TrueFalse
7
The greatest common factor of 12 and 20 is 2.
TrueFalse
8
What is the greatest common factor of 36 and 48?
1264
9
18 + 30 = 6 × ( + 5)
10
28 + 42 = × (2 + 3)
11
Join each pair of numbers to its greatest common factor.
19 and 15
216 and 20
312 and 30
410 and 35
A4
B5
C3
D6
12
Bus A leaves the station every 8 minutes and bus B every 12 minutes. They leave together now. After how many minutes do they next leave together?
44824
13
A baker has 24 rolls and 36 muffins. She makes the most equal trays, each with the same mix and nothing left over. How many trays?
14
Sensei says the greatest common factor of 10 and 15 is 30. Write how you know he is wrong.
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