Page 338 - Start Up Mathematics_7

Let’s Evaluate Maths Lab Activity (Worksheet)

1. (a) 1.005 kg (b) 0.237 m (c) 2.025 L Operation Closure Commutative Associative Identity
2. (a) 23.78 (b) 1.23 (c) 18.0081 (d) 16,119.5 Addition Yes Yes Yes Yes
3. (a) 3.4556 (b) 40.4 (c) 4.02 (d) 0.452 Subtraction Yes No No No
Multiplication Yes Yes Yes Yes
2
4. 212.175 m 5. 12.055 km 6. ` 756.15
Division No No No No
7. 144 8. 245
Exploring Extended Concepts
Thinking Skills
1. 97,862.4531; 17,342.6589 (a) < (b) > (c) < (d) < (e) < (f) =
Reason It Out!
2. (a) 251.25 m (b) ` 3,768.75
(a) 7 (b) Yes by adding infinite zeros after decimal part
3. ` 184.50 4. 7 attempts 5. 5.76 g
6. (a) ` 264.68 (b) 5.6 hours Review Exercises
Multiple Choice Questions
Values and Life Skills
1. a 2. c 3. d 4. a
460.585 km
5. a 6. d 7. c 8. a
Exemplar Problems
Solve Mentally
1. a 2. True 3. False 4. ` 112.50
True or False
5. 7.41 6. 24.15
1. True 2. True 3. False 4. False 5. False
Chapter 4 6. False 7. True 8. True 9. False 10. True

Exercise 4.1 Fill in the Blanks
− 1 1 1 1. simplest 2. infinite 3. bc 4. <
1. (a) ,, 0 (b) 0 , , 1
2 2 2 5. terminating 6. 0
− 2 − 3 − 4 5 − 10 − 15
2. (a) , , (b) , , 3. (a), (b) Answer in One Word or a Line
6 9 12 − 3 6 9
− 3 2 − 2 − 3 1. 1 2. 0 3. 4
4. (a) < (b) > 4 3
7 3 5 6
1 1 − 1 4. Either 2 or 5 or both 5. − 77
,
(c) > (d) 0 > 11 11
− 3 − 2 3 6. Does not exist 7. 1
− 3 –2 –1 − 3 1 2
5. (a) , , (b) , ,
7 7 7 6 93 Let’s Evaluate
2 − 3 − 2 1 3 − 17  − 6 
6. (a) (b) (c) (d) − 1 1. Positive rational numbers , , −   ;
5 4 3 4 4 − 21  10 
Exercise 4.2 Negative rational numbers − 8 , 3

− 5 7 − 7 9 − 8
1. (a) (b) (c) 2. (a) > (b) > (c) =
17 15 17
21 5 3. (a) − 21 (b) –1, 0 (c) 3.21, 3.22
,
2. (a) (b) –1 (c) 15 3
22 144 − 37 33
–3 6 11 1 4. (a) –27 (b) –9 5. (a) (b) 20
3. (a) (b) (c) (d) 7 60
13 23 30 3 − 61 1 − 24 273
4 13 39 7 6. (a) (b) 7. (a) (b) 323
4. (a) (b) (c) (d) 40 8 77
5 − 27 − 17 15 6 − 9
− 2 − 3 − 21 5 8. (a) (b)
5. (a) (b) (c) (d) 5 4
7 13 209 6 − 3 − 12
55 35 − 5 9. (a) 18 (b) (c)
6. (a) 39 (b) (c) (d) − 30 5 20
126 –4 14

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