Answer Key: Prime and Composite Numbers:
Answer Key: Prime and Composite Numbers One:
Write all the factors for the numbers below and circle whether they are prime or composite numbers (the first one is done for you):
|3 | 1 | 3 | | | | | Prime | Composite |
|5 | 1 | 5 | | | | | Prime | Composite |
|9 | 1 | 3 | 9 | | | | Prime | Composite |
|14 | 1 | 2 | 7 | 14 | | | Prime | Composite |
|21 | 1 | 3 | 7 | 21 | | | Prime | Composite |
|31 | 1 | 31 | | | | | Prime | Composite |
|35 | 1 | 5 | 7 | 35 | | | Prime | Composite |
|43 | 1 | 43 | | | | | Prime | Composite |
|51 | 1 | 3 | 17 | 51 | | | Prime | Composite |
|59 | 1 | 59 | | | | | Prime | Composite |
Answer Key: Prime and Composite Numbers Practice Two:
Write all the factors for the numbers below and circle whether they are prime or composite numbers (the first one is done for you):
|3 | 1 | 3 | | | | | Prime | Composite |
|7 | 1 | 7 | | | | | Prime | Composite |
|9 | 1 | 3 | 9 | | | | Prime | Composite |
|16 | 1 | 2 | 4 | 8 | 16 | | Prime | Composite |
|18 | 1 | 2 | 3 | 6 | 9 | 18 | Prime | Composite |
|23 | 1 | 23 | | | | | Prime | Composite |
|33 | 1 | 3 | 11 | 33 | | | Prime | Composite |
|41 | 1 | 41 | | | | | Prime | Composite |
|63 | 1 | 3 | 7 | 9 | 21 | 63 | Prime | Composite |
|97 | 1 | 97 | | | | | Prime | Composite |
Answer Key: Sample Word Problems:
1. There are no equal ways to sort the books evenly because 23 is a prime number. One group of 23 is the only even way to split them with no remainders.
2. You can arrange them into 2 groups of 14 and 4 groups of 7. You could also arrange them into 14 groups of 2 and 7 groups of 4. Clearly, 28 is a composite number.
3. 53 is a prime number, so there is not a way to split them evenly and not throw one away.
4. The farmer can plant the corn in 2 rows of 18 or 18 rows of 2. He can plant it in 3 rows of 12 or 12 rows of 3. He can plant it in 4 rows of 9 or 9 rows of 4. He could plant it in 6 rows of 6. He could also plant it in 1 row of 36. 36 is a composite number.
5. You can group them 2 ways: One group of 25 or 5 groups of 5. Any other way would not allow the teams to be even. 25 is a composite number.
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