Page 223 - Start Up Mathematics_5

(f) 2 thousands + 1 ten + 4 ones + 3 tenths + (c) 45.160, 47.245, 48.060, 50.270, 50.981
8 hundredths = 2000 + 10 + 4 + 3 + 8 (d) 21.49, 21.50, 22.03, 22.80, 26.04
10 100
2. (a) 98.102, 98.042, 97.463, 96.310, 96.020
(g) 9 thousands + 8 hundreds + 2 tens + 4 ones + (b) 108.39, 108.15, 105.81, 102.70, 102.04
7 hundredths = 9000 + 800 + 20 + 4 + 7 (c) 50.981, 50.270, 48.060, 47.245, 45.160
100
(d) 26.04, 22.80, 22.03, 21.50, 21.49
(h) 6 hundreds + 7 tenths + 1 hundredth +
4 thousandths = 600 + 7 + 1 + 4 3. (a) < (b) = (c) = (d) < (e) > (f) =
10 100 1000
Let’s Evaluate
(i) 3 hundreds + 4 ones + 1 tenth + 8 hundredths
3
6
4
+ 9 thousandths = 300 + 4 + 1 + 8 + 9 1. (a) 6 tenths or 10 (b) 59.35 (c) 90 + 100 + 1000
10 100 1000
145
(j) 9 tens + 9 ones + 7 hundredths + (d) 0.37 (e) 1000
5 thousandths = 90 + 9 + 7 + 5 2. (a) 92.14 = 9 tens + 2 ones + 1 tenths +
100 1000
4 hundredths
3. (a) 2.3 (b) 15.27 (c) 7520.806
(b) 184.38 = 1 hundred + 8 tens + 4 ones +
(d) 6051.005 (e) 1305.04 (f) 230.007
3 tenths + 8 hundredths
4. (a) Integral part = 74, decimal part = 26
(c) 75.24 (d) 60.31
(b) Integral part = 130, decimal part = 02
3. (a) 0.034, 0.246, 0.76, 0.85, 0.981
(c) Integral part = 9876, decimal part = 172
(b) 6.024, 6.240, 6.450, 7.013, 7.140
(d) Integral part = 5, decimal part = 0028
4. (a) 63.12, 63.08, 62.5, 61.80, 60.7
Exercise 6.2
(b) 138.08, 134.7, 131.64, 130.05, 129.95
1. (a) Like decimals: 7.21, 28.04 and 14.6, 100.9
5. (a) (ii) (b) (i) (c) (iv)
(b) 19.04, 13.75 and 120.2, 79.8
(c) 1.02, 6.07 and 2.348, 21.186 Scratch Your Brain
(d) 0.24, 1.26 and 0.591, 3.009 1. (a) 475.30 (b) 74.33
(e) 92.9, 93.8, 90.5
(f) 11.29, 19.07 and 6.104, 13.008 2. 34.729, 34.261, 34.181, 33.191, 33.156 (Answer to this
question may vary)
2. (a) 64.480, 92.400, 7.175, 128.300
(b) 3.1426, 19.0700, 25.8000, 41.0020 Chapter 7: Decimals—Four Operations
(c) 1.01, 1.32, 2.50, 7.90
(d) 101.260, 34.758, 215.700, 381.240 Exercise 7.1
(e) 59.0800, 617.0190, 28.1026, 88.5000 1. Students to do on their own.
(f) 14.0300, 256.9000, 74.2150, 439.1764 2. (a) 131.71 (b) 96.84 (c) 133.64 (d) 471.93
(e) 2799.77 (f) 89.326 (g) 806.672
Exercise 6.3
(h) 390.74 (i) 167.635
1. (a) 0.15 (b) 0.027 (c) 0.132 (d) 6.85 (e) 2.873 3. (a) 10.78 (b) 212.514 (c) 196.426 (d) 4480.51
(f) 0.09 (g) 0.92 (h) 0.308 (i) 7.96 (j) 0.007 (e) 2181.78 (f) 122.691 (g) 112.155 (h) 994.62
2. (a) 4 (b) 8 (c) 11 (d) 36
10 10 100 100 (i) 29.65

(e) 2 (f) 48 (g) 623 (h) 15009 4. (a) 80.25 (b) 21.79 (c) 133.814 (d) 100.66
100 1000 100 1000 (e) 742.43 (f) 30.535 (g) 79.184 (h) 10.50
(i) 7264 (j) 2108 (i) 18.551
1000 100
Exercise 6.4 Exercise 7.2
1. (a) 2.34, 5.34, 16.34, 21.34, 29.34 1. 7.500 kg 2. 2.250 km 3. 7.50 cm 4. 0.2 m
(b) 8.006, 8.020, 8.062, 8.206, 8.620 5. 0.370 kg 6. 2375 mL

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