Types of Numbers Answers

1.

a. False
b. True
c. False
d. True
e. True
f. False


2.
(a) {5, 10, 15, 20} 
(b) {15, 30, 45, 60}  
(c) {3, 6, 9, 12}
(d) {20, 40, 60, 80}

3.
(a) {1, 2, 3, 4, 6, 8, 12, 24} 
(b) {1, 2, 3, 6, 9, 18} 
(c) {1, 2, 3, 4, 6, 9, 12, 18, 36}
(d) {1, 2, 11, 22}

4. (a) 10 (b) 60
5. (a) 2 x 2 x 2or 23 
(b) 2 x 2 x 3 or 22 x 3
(c) 2 x 2 x 2 x 3 or 23 x 3

6.

(a) 4

(b) 1.2

(c) 30

(d) 36

(e) 5.29

(f) 0.16

7.

(a) 0.5 or 1/2

(b) 5

(c) 0.067 (2 s.f.) or 1/15

(d) 1.25 or 5/4

(e) 0.29 (2 s.f.) or 2/7

(f) 0.005 or 1/200

8. (a) 0.125    (b) 0.4   (c) 0.004

9.

(a) 8.32 × 101

(b) 3.2 × 10 -1

(c) 5.417 × 102

(d) 9.63 × 10 - 3

(e) 8.5 × 100

(f) 3.21 × 104

10. (a) 512   (b) 0.00361   (c) 80 000