Prime factorisation

1. 1.
   Write 170 as a product of prime factors.
   a)2 × 5 × 17b)2 × 85c)2 × 5 × 18d)5 × 17
2. 2.
   Write 58 as a product of prime factors.
   a)2 × 30b)2 × 29c)29
3. 3.
   Which number is prime?
   a)18b)17c)135d)87
4. 4.
   Write 45 as a product of prime factors.
   a)2 × 22b)3 × 5c)3 × 3 × 6d)3 × 3 × 5
5. 5.
   Is 33 prime or composite?
   a)Primeb)Composite
6. 6.
   Write 39 as a product of prime factors.
   a)3 × 13b)3 × 14c)2 × 19d)13
7. 7.
   Write 48 as a product of prime factors.
   a)2 × 2 × 2 × 3b)2 × 24c)2 × 2 × 2 × 2 × 4d)2 × 2 × 2 × 2 × 3
8. 8.
   Which number is prime?
   a)190b)34c)35d)107
9. 9.
   Is 41 prime or composite?
   a)Primeb)Composite
10. 10.
    Write 156 as a product of prime factors.
    a)2 × 78b)2 × 2 × 3 × 13c)2 × 3 × 13d)2 × 2 × 3 × 14
11. 11.
    Write 194 as a product of prime factors.
    a)2 × 98b)2 × 97c)97
12. 12.
    Write 24 as a product of prime factors.
    a)2 × 12b)2 × 2 × 2 × 3c)2 × 2 × 2 × 4d)2 × 2 × 3
13. 13.
    Write 78 as a product of prime factors.
    a)2 × 3 × 13b)3 × 13c)2 × 3 × 14d)2 × 39
14. 14.
    Is 6 prime or composite?
    a)Primeb)Composite
15. 15.
    Is 136 prime or composite?
    a)Primeb)Composite
16. 16.
    Write 198 as a product of prime factors.
    a)3 × 3 × 11b)2 × 3 × 3 × 12c)2 × 3 × 3 × 11d)2 × 99
17. 17.
    Write 52 as a product of prime factors.
    a)2 × 13b)2 × 26c)2 × 2 × 14d)2 × 2 × 13
18. 18.
    Write 124 as a product of prime factors.
    a)2 × 62b)2 × 2 × 31c)2 × 2 × 32d)2 × 31
19. 19.
    Write 94 as a product of prime factors.
    a)2 × 47b)47c)2 × 48
20. 20.
    Is 182 prime or composite?
    a)Primeb)Composite

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