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 |