Decimals

Question 1

Calculate the difference between 38.612 and 13.87

Answer 1

24.742

Question 2

Subtract 2.317 from 3.9

Answer 2

1.583

Question 3

The lift in a tall building rises one floor in 13.9 seconds. If the lift rises 15 floors, how long will it take?

Answer 3

208.5 seconds

Question 4

Add 8.7 / 0.7 x 0.07 x 0.06

Answer 4

12.004

Question 5

Convert 1/8 into a decimal

Answer 5

0.125

Question 6

1.20 + 1.15

Answer 6

2.35

Question 7

8.28 + 9.46 + 0.84

Answer 7

18.58

Question 8

6.50-1.25

Answer 8

5.25

Question 9

58.0 - 0.32

Answer 9

57.68

Question 10

100.0 -1.85

Answer 10

98.15

Question 11

10 x 2.5

Answer 11

25

Question 12

10 x 0.25

Answer 12

2.5

Question 13

100 x 6.033

Answer 13

603.3

Question 14

10 x 0.003

Answer 14

0.03

Question 15

100 x 0.876

Answer 15

87.6

Question 16

1.25 x 5

Answer 16

6.25

Question 17

3.2 x 4

Answer 17

12.8

Question 18

5.12 x .34

Answer 18

1.7408

Question 19

3.123 x .18

Answer 19

0.56214

Question 20

4/12.48

Answer 20

3.12

Question 21

34.62/10

Answer 21

3.462

Question 22

34.62/ 100

Answer 22

0.3462

Question 23

156.4/10

Answer 23

15.64

Question 24

156.4/100

Answer 24

1.564

Question 25

4/2.324

Answer 25

0.581

Question 26

0.6/7.2

Answer 26

12

Question 27

1.5/01530

Answer 27

0.102

Question 28

9/52.29

Answer 28

5.81

Question 29

12.0/12.48

Answer 29

1.04

Question 30

0.02/4.486

Answer 30

224.3

Question 31

0.26/8.8086

Answer 31

31.1

Question 32

$93.05/15

Answer 32

6.20c

Question 33

Write as a decimal: three and seven tenths…

Answer 33

3.7

Question 34

Write as a decimal: Seventy-four thousandths

Answer 34

0.074

Question 35

Write as a decimal: One and twenty-five thousandths

Answer 35

1.025

Question 36

Write as a fraction or mixed number: 1.2

Answer 36

1 2/10

Question 37

Write as a fraction/mixed number: 0.68

Answer 37

68/100

Question 38

Write as a fraction/mixed number? 3.418

Answer 38

3 418/1000

Question 39

Write as a fraction/mixed number? 0.07

Answer 39

7/100

Question 40

Write as a fraction/mixed number? 6.15

Answer 40

6 15/100

Question 41

80.6 + 4.75

Answer 41

85.35

Question 42

12/3.682 + 75 + 3.8 + 0.00096

Answer 42

95.1816

Question 43

9.86 - 3.54

Answer 43

6.32

Question 44

8.394 - 3.52

Answer 44

4.874

Question 45

2.198 - 3.852 + 2.053

Answer 45

0.399

Question 46

When filling up my car with petroleum I have to put in 27.8L. I know that the tank holds 40L. How much petroleum did I have left in my tank before fuelling?

Answer 46

12.2L

Question 47

The thickness of several pieces of metal were measured with a micrometer and found to be 0.083, 0.375, 0.1648 and 0.251mm. What is the combined thickness of all the pieces of metal?

Answer 47

0.8738mm

Question 48

On a map the length of the road as 41.2km, but a surveyor found this measurement to be 1.37km too small. What was the true length of the road?

Answer 48

42.57km

Question 49

The gap in a distributors point had to be 0.65mm. A motor mechanic measured the gap with a set of feeler gauges and found it to be 0.08mm too small. How wide was the spark gap?

Answer 49

0.57mm

Question 50

An electrician needed copper wire with a diameter of 0.85mm. The nearest she had was 1.10mm diameter. Was it too thick or too thin, and baby how much?

Answer 50

Too thick by 0.25mm