Page 24 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

5 Addition of decimals 2 9

3
a 4.56 + 32.075 + 256.6245 + 15.0358
9
500 + 70 + 5 + 3 10 + 2 2 100 + 9 1000
3
70 +
5 +
500 +
+
500 + 70 + 5 + 3 + + 100 + 9 1.54
2 +
5 + 10
+ 1000
70 +
b 462.492 + 725.526 + 309.345 + 626.602
500 +
10 100 1000 1.54
3 10
2 100
9 1000
1.54
1.1

6 Subtract the following decimals
500 + 70 + 5 +1 + 3 + 5 1.54
1000
200 +
1.1
100 +

1.1
1
3
5
200 + 9 + 9 + 1 1 + 10 + 3 3 + + – 9.6479 1.54
5
a 612.5200 10010
1000
9 +
1.1
200 +
+
5
100
10
1000
– 215.6000
b 573.9246
200 + 9 + 10 + 100 + 1000 1.1
1 10
5 1000
3 100
200 + 9 + 3 + + 5
7 Add and subtract the following
1
10
5
3
3 100 1000 5 8
1
5
5
a 56.725 + 48.258 – 32.564 1 1 8
3
8
5 5 58 12
b 16.45 + 124.56 + 62.7 - 3.243 1 12
35 10
10
8 25
10
5 4
8 Multiply the following 12
12
10
25
25
4
4
a By 10,100,1000 12 25

10 4 54
24

54

i 3.754 x 10 25
54
24 4 1000
24
54
24 1000
1000
ii 8.964 x 100
1000
54 12
24
iii 2.3786 x 1000
12
12
1000 25
12
iv 0.005 x 1000
25
25
12 25
8
b By whole numbers
25 8
8
25
i 8.4 x 7
8
25
25
ii 56.72 x 8
8 25 3
1
3
3
c By another decimal figure (use calculator)
25 25
1
1 3
1 25
25
i 15.64 x 7.68
3 25
1 62.5
ii 2.642 x 1.562
25
62.5
62.5
25
9 Divide the following
62.5
25
25
25
62.5
a 64.56
25
64.56
64.56
10
64.56
10
b 10
10
64.56
0.42
0.42
10 100
c 0.42
0.42
100
100
100
0.42
48.356
d
48.356
48.356
100
1000
48.356
1000
3 2 9 10 Division
1000
1000
500 + 70 + 5 + 3 + 2 + 9 48.356 16.8

500 + 70 + 5 + 10 + 100 + 1000 16.8
16.8
1000 1.2
1.54
10 100 1000 a 16.8
9
3
2
1.2
1.2
1.54
1.1
500 + 70 + 1 5 + 10 3 + 1005 + 1000 16.8
1.2
200 + 9 + 1 + 3 + 5 b 1.54
1.1

200 + 9 + 10 + 100 + 1000 1.2
10 100 1000 1.1
5
1
3
200 + 9 + + + 11 Change the fraction into a decimal
3 10 100 1000 5
1
3 5
8
5 i 1
3 5 5 8
10 1 12
5 10 ii 8 12
25
4
25
12
4
10 12 Find the value
54
25
24 4 54 20.5 x 40 ÷ 10.25 + 18.50

24 1000
1000
54
24 12 11
1000
12
25
CITS : WCS - Electrical - Exercise 1 CITS : WCS - Electrical - Exercise 1
25
12
8 25
8
25
25
8
3
1 3
25
1 25
25
3
1
25
62.5
62.5
25
25
62.5
64.56
25
64.56
10
10
64.56
0.42
10
0.42
100
100
0.42
48.356
100
48.356
1000
1000
48.356
16.8
1000
16.8
1.2
1.2
16.8
1.2