1. a. 129, 131, 133, 137, 139, 143.
b. 8, 16, 24, 32, 40, 48, 56, 64
c. 121, 144, 169,196
d. 12, 14, 15, 16, 18

2. Give the factors of the following numbers:

 (a) 1, 2, 3, 6 (b) 1, 2, 3, 4, 6, 8, 12, 24 (c) 1, 5, 25 (d) 1, 43 (e) 1, 2, 4, 8, 16, 32, 64 (f) 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

3. Write the following numbers in terms of their prime factors:

 (a) 2 x 3 (b) 2 x 3 x 3 = 2 x 32 (c) 1 x 19 (d) 2 x 2 x 2 x 3 = 23 x 3 (e) 2x 2 x 2 x 2 x 2x2 = 26 (f) 2 x 5 x 5 = 2 x 52

4. Write in exponent form:

 (a) 33 (b) 22 x 53 (c) 23 x 72 (d) 22 x 3 x 5 (e) 33 x 25 (f) 36

5. Find the reciprocals of the following numbers (give the answer as a decimal and as a fraction):

 (a) 1/ 2 or 0.5 (b) 5/ 4 or 1.25 (c) 1/10 or 0.1 (d) 5/ 2 or 2.5 (e) 7/ 25 or 0.28 (f) 100/101 or 0.99 (rounded)

6. Find the value of:

 (a) 81 (b) 12 (c) 2 (d) 1/ 2 (e) 128 (f) 0.125

7. Find the highest common factor of:

 (a) HCF = 4 (b) HCF = 10 (c) HCF = 15

8. Find the lowest common multiple of:

 (a) LCM = 20 (b) LCM = 24 (c)LCM = 60