1. What are the factors of 15?
a) 1,3,5,6,15
b) 1,3,5,15
c) 1,2,3,5,15
d) 1,2,5,15

2. What are the factors of 24?
a) 1,2,3,5,7,12,24
b) 1,3,6,8,24
c) 1,2,3,6,8,12,24
d) 1,2,3,6,9,12,24

3. If x is a prime number then its factors are:
0,1,x
1, x
1,2,x
1,3,x

4. Which of the following lists consists only of prime numbers?
1,2,3,4,7,9,12,13
3,5,7,9,11,13
2,3,5,7,11,13
2,3,4,5,7,11,13

5. The common multiple of 2,3,4 and 6 is?
6
12
15
20

6. The Least Common Multiple of 6 and 9 is
9
20
18
24

7. The Least Common Multiple of 9 and 15 is?
30
45
135
81

8. The Least Common Multiple of 24 and 30 is
90
150
120
240

9. The Least Common Multiple of 18 and 32 is
180
320
288
290

10. The Least Common Multiple of 27 and 93 is
270
280
279
393

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