Unit 1 Factors and Multiples
4.OA.4
1. Find all the factor pairs for the following numbers:
21
a)
44
56
2. Is 4 a factor of 52? Justify your answer.
3. Is 32 a multiple of 6? Support your answer by using a picture or diagram.
4. Is 72 a multiple of 3? Justify your answer.
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Unit 1 Factors and Multiples
4.OA.4
5. 36 is NOT a multiple of which of the following numbers? Justify your
answer.
Choose two.
2
3
4
5
7
9
6. Darsh was asked to circle all the prime numbers in the box. These are the
numbers he chose:
5
6
7
8
9
10
Do you agree or disagree? Why or why not?
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Unit 1 Factors and Multiples
4.OA.4
7. Circle all the composite numbers in the box. Explain your reasoning.
15
16
17
18
19
20
8. Is 51 prime or composite? _________________________
Explain your reasoning.
9. Give two prime numbers greater than 70. Support your answer by using a
picture or diagram.
10. Give two composite numbers less than 30. Support your answer by using
a picture or diagram.
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