1. True or false?
a. 4 > 5
b. 3 + 5 = 5 + 3
c. 5 < 4
d. 5 is a factor of 120
e. 17 is a prime number
f. 4 x 3 x 5 are the prime factors of 60.
2. List the first four multiples of:
(a) 5 (b) 15 (c) 3 (d) 20
3. List the factors of: (a) 24 (b) 18 (c) 36 (d) 22
4. a. What is the highest common factor (HCF) of 20 and 30
b. What is the lowest common multiple (LCM) of 20 and 30
5.Write these numbers as a product of their prime factors. (a)8 (b)12 (c) 24
6. Calculate:
(a) |
(d) 6 2 |
(b) |
(e) (2.3) 2 |
(c) |
(f) (0.4) 2 |
7. Find the reciprocals of:
(a) 2 |
(d) |
(b) 0.2 |
(e) |
(c) 15 |
(f) 200 |
. Evaluate (write as a decimal)
8. (a) (b) (c)
9. Write the following numbers in standard form:
(a) 83.2 |
(d) 0.00963 |
(b) 0.32 |
(e) 8.5 |
(c) 541.7 |
(f) 321 × 10 2 |
10. Write the following numbers as ordinary decimals:
(a) 5.12 × 10 2 (b) 3.61 × 10 - 3 (c) 8 × 10 4