By C. Oliver, A. Ledsham, R. Elvin

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**Extra info for Comprehensive Mathematics Practice: Bk. 1**

**Sample text**

An angle that is greater than 90° but less than 180° is called an obtuse angle. The pointer moves from 0 to 50. This is 350°0 of a complete turn. · an g1 e. This is an acute angle. b) An angle of 180° is called a straight angle because it is a straight line. An angle that is greater than 180° is called a reflex angle. The pointer moves from 0 to 150. This is ;~g of a complete turn . :. angle= ~~g X 360° = 180° This is a straight angle. Part 3 34 Geometry 15. The pictures show the readings on a weather glass for each day of a certain week.

Write 4 as 4·0) b) 5·2- 2·8 c) 9 - 6·6 (write 9 as 9·0) d) 6·6 -4·2 a) 4·0 -2·6 b) 1·4 5·2 -2·8 c) 9·0 -6·6 2·4 d) 2·4 6·6 -4·2 2·4 So a) is the 'odd answer out'. 2. a) 5·9 -3 ·6 b) 4 ·8- 2·3 c) 7·5- 5·2 d) 6·4 -4 ·1 3. a) b) c) d) b)7·6 -4 ·3 c) 6·5- 3·2 d) 9 ·7- 6·6 5. a)7 ·8-3·3 b) 5·9 -1·4 c) 8·7 -4 ·1 d) 6·5 -2 6. a) 9·9- 6·5 b) 5·6 -2 ·2 c) 8·4- 5 d) 6·8- 3·3 7. a) 6·9 -1·8 b)8 ·7-3 ·5 c) 9·6- 4·4 d)7·8- 2·6 8. a) 8 ·5- 2·2 b)7 ·6 -1-4 c) 9 ·3- 3·1 d) 6·9 -0·7 9. a) 6·9 -1-4 b)7·8 -2·3 c) 9·7 -4·1 d) 8·5- 3 4.

To multiply a number by 100, move each figure two places to the left. This rule is also followed when multiplying decimals. Example 5 Work out the following. a) 6-4710 d) 0-4 7 100 a) 6 · 4 7 Example 4 a) 4 ·6 X 10 d) 0·05 X 10 b) 1·1 X 100 c) 0·23 X 10 e) 0·004 X 100 a) 4 · 6 X 10 = 4 6 · 0 TU · t U·t u. t b) 6 u b) 6710 c) 7·3 7 100 10 = 0 . 64 u. t h 10 = 0 . 6 u. t c) 7·3 100 = 0·073 d) 0·4 100 = 0 ·004 b) 1 · 1 X 100 = 1 1 0 U·t HTU·t c) 0 ·23 X 10 = 2·3 d) 0·05 X e) 0·04 X 100 = 0·4 Exercise 44 Divide each of the following by 10.