MATHS [3 marks sum]

0.12 of(0.104 – 0.02)+ 0.36 x 0.5
= 0.12 of 0.084 + 0.36 × 0.5
= 0.01008 + 0.180 = 0.19008
0.104
- 0.020
0.084
0.084
x 0.12
0.01008
0.01008
+ 0.180
0.19008

0.98 of 235 – 0.09 of 3.2 = 230.30 - 0.288 = 230.012
230.300
- 0.288
230.012
3.20
× 0.09
.2880
235
× 0.98
1880
21150
23030

6.25 of 8.4 – 4.7 of 3.24
= 52.500 - 15.228 = 37.272
6.25
× 8.4
2500
50000
52500
3.24
× 4.7
2268
12960
15228

2.3 of 7.3 kg + 0.9 of 0.48 kg
= 16.79 kg + 0.432 kg = 17.222 kg
7.3
× 2.3
219
1460
1679
0.48
× 0.9
0.432
16.790
+ 0.432
17.222

0.5 of Rs. 7.60 + 1.62 of Rs. 30
= Rs. 3.80 + Rs. 48.60
= Rs. 52.40
7.60
× 0.5
3.800
1.62
× 30
48.60

Cost of 1 kg oil = Rs. 73.40
∴ Cost of 9.75 kg oil = Rs. 73.40 × 9.75
= Rs. 715.6500
= Rs. 715.65
73.40
× 9.75
36700
513800
6606000
7156500

Weight of one object = 3.06 kg
∴ Weight of 48 object = 3.06 × 48 = 146.88 kg
3.06
× 48
2448
12240
14688

Correct to five significant figures
14.29462→ 14.295
19.2 → 19.200
46356.82 →46357
69 → 69.000

Correct to four significant figures
60.974 →60.97
2.8753 → 2.875
0.001789 → 0.001789
400.04 → 400.0

Correct to three significant figures are
35.869 → 35.9
0.008426 →0.00843
4.952→ 4.95
382.7 →383

Total weight of wheat = 36.75 kg
Cost of 1 kg of wheat = Rs. 12.80
∴ Cost of 36.75 kg of wheat
= 36.75 × 12.80 = Rs. 470.40
36.75
× 12.80
470.40

0.5 x 0.6 x 0.7
0.5
× 0.6
0.30
000
0.30
× 0.7
210
0000
0.210
(Sum of decimal places = 1 + 1 + 1 = 3)
∴ 0.5 x 0.6 x 0.7 = 0.210 or 0.21

0.4 x 0.04 x 0.004
0.004
× 0.04
0016
00000
000000
0.00016
× 0.4
0.000064
(Sum of decimal places = 1 + 2 + 3 = 6)
∴ 0.4 x 0.04 x 0.004 = 0.000064

1.2 x 1.2 x 0.4
1.2
× 1.2
0.24
120
1.44
× 0.4
576
0000
0.576
(Sum of decimal places = 1 + 1 + 1 = 3)
∴ 1.2 x 1.2 x 0.4 = 0.576

0.3 x 0.3 x 0.3
0.3
× 0.3
09
000
0.09
× 0.3
0.027
(Sum of decimal places = 1 + 1 + 1 = 3)
∴ 0.3 x 0.3 x 0.3 = 0.027

0.8 x 1.5 x 0.6
0.8
× 0.8
120
000
1.20
× 0.6
720
0000
0.720
(Sum of decimal places = 1 + 1 + 1 = 3)
∴ 0.8 x 1.5 x 0.6 = 0.720 or 0.72

3.2 x 2.5 x 0.7
3.2
× 2.5
160
640
8.00
× 0.7
5600
0000
5.600
(Sum of decimal places = 1 + 1 + 1 = 3)
∴ 3.2 x 2.5 x 0.7 = 5.600 or 5.6

4.3 x 0.52 x 0.3
0.52
× 4.3
156
2080
2.236
× 0.3
6708
00000
0.6708
(Sum of decimal places = 1 + 2 + 1 = 4)
∴ 4.3 x 0.52 x 0.3 = 0.6708

4.906 x (0.2)² = 4.906 x 0.2 x 0.2
= 4.906 x 0.04 = 0.19624
Now 0.19624 + 10 = 0.019624,
0.19624 + 100 = 0.0019624,
0.19624 + 1000 = 0.00019624,
0.19624 + 10000 = 0.000019624

0.8 × 1.2 × 0.25 = 0.96 × 0.25
= 0.2400
= 0.24
96
× 25
480
1920
2400

2.4 × 3.5 × 4.8 = 8.40 × 4.8
= 8.4 × 4.8
= 40.32
24
× 35
120
720
840
8.4
× 4.8
672
3360
4032

4.75 × 0.08 × 3 = 4.75 × 0.08 × 3
= 4.75 × 0.24
= 1.1400 = 1.14
4.75
× 0.24
1900
9500
1.1400

Total = 584.29
Given number = 213.95
Required difference = 584.29 - 213.95 = 370.34
584.29
- 213.95
370.34

Sum = 100
The number = 19.29
∴ The number which is to be subtracted
= 100 - 19.29 = 80.71
100.00
- 19.29
80.71

Sum = 80.375
Given number = 39.589
∴ The number which is to be added
= 80.375 - 39.587 = 40.788
80.375
- 39.587
40.788

Sum of 19.38 + 56.025 = 75.405
19.38
+ 56.025
75.405
Difference of 200.111 and 75.405
= 200.111 - 75.405 = 124.706
200.111
- 75.405
124.706

555.555 + 55.555 – 5.55 – 0.555
= (555.555 + 55.555) - (5.55 + 0.555)
555.555
+ 55.555
611.110
611.110
- 6.105
605.005

38.00 – 30 + 200.200 – 0.230
= (38.00 + 200.200) - (30 + 0.230)
= 238.200 - 30.230
= 207.970 = 207.97
238.200
+ 30.230
207.970

0.1835 + 163.2005 – 25.9 – 100
= (0.1835 + 163.2005) - (25.9 + 100)
= 163.3840 - 125.9 = 37.484
0.1835
+ 163.2005
163.3840
25.9
+ 100.0
125.9
163.3840
- 125.9000
37.4840

4000 – 30.51 – 753.101 – 69.43
= 4000 - (30.51 + 753.101 + 69.43)
= 4000 - 853.041 = 3146.959
30.510
+ 753.101
+ 69.430
853.041
4000.000
- 853.041
3146.959

32.8 – 13 – 10.725 + 3.517
= (32.8 + 3.517) - (13 + 10.725)
= 36.317 - 23.725 = 12.592
13.000
- 10.725
23.725
32.8
+ 3.517
36.317
36.317
- 23.725
12.592

86 + 16.95 – 3.0042
= 102.95 - 3.0042
= 99.9458
86.00
+ 16.95
102.95
102.9500
- 3.0042
99.9458