## Operations on Decimals Exercises – Set 2

This is our second set of exercises on operations on decimals.

Perform the indicated operation.

1.) 1.5 + 0.7
2.) 10.5 + 3.08 + 4.026
3.) 0.8 – 0.2
4.) 8.06 – 3.215
5.) 5.7 – 0.9
6.) .22 × .6
7.) 5.02 × 1.2
8.) 8.1 ÷ 0.009
9.) .63 ÷ 30
10.) .7 ÷ .005

1.) 2.2
2.) 17.606
3.) 0.6
4.) 4.845
5.) 4.8
6.) 0.132
7.) 6.024
8.) 900
9.) 0.021
10.) 140

Enjoy!

You might also like: Operations on Decimals Exercises – Set 1

## Multiplication and Division of Fractions Exercises – Set 2

Find the product of the following:

1.) $\dfrac{3}{4} \times \dfrac{5}{8}$

2.) $\dfrac{1}{8} \times \dfrac{3}{4} \times \dfrac{2}{3}$

3.) $2 \dfrac{3}{5} \times \dfrac{2}{3}$

4.) $7 \dfrac{5}{6} \times 1 \dfrac{3}{4}$

5.) $7 \times 2 \dfrac{3}{14}$

6.) $\dfrac{2}{3} \div \dfrac{3}{4}$

7.) $15 \div \dfrac{5}{6}$

8.) $\dfrac{3}{8} \div 4$

9.) $1 \dfrac{2}{3} \div \dfrac{4}{5}$

10.) $7 \dfrac{1}{4} \div \dfrac{1}{8}$

Solution:

1.) $\dfrac{15}{32}$

2.) $\dfrac{1}{16}$
$\dfrac{1}{8} \times \dfrac{3}{4} \times \dfrac{2}{3}$
$= \dfrac{6}{96} or \dfrac{1}{16}$

3.) $1 \dfrac{11}{15}$
$2 \dfrac{3}{5} \times \dfrac{2}{3}$
$= \dfrac{13}{5} \times \dfrac{2}{3}$
$= \dfrac{26}{15} or 1 \dfrac{11}{15}$

4.) $13 \dfrac{17}{24}$
$= 7 \dfrac{5}{6} \times 1 \dfrac{3}{4}$
$= \dfrac{47}{6} \times \dfrac{7}{4}$
$= \dfrac{329}{24} \times 13 \dfrac{17}{24}$

5.) $15 \dfrac{1}{12}$
$7 \times 2 \dfrac{3}{14}$
$= \dfrac{7}{1} \times \dfrac{31}{14}$
$= \dfrac{217}{14} or 15 \dfrac{7}{14} or 15 \dfrac{1}{2}$

6.) $\dfrac{8}{9}$
$\dfrac{2}{3} \div \dfrac{3}{4}$
$= \dfrac{3}{2} \times \dfrac{3}{4} = \dfrac{8}{9}$

7.) $\dfrac{1}{18}$
$= 15 \div \dfrac{5}{6}$
$= \dfrac{1}{15} \times \dfrac{5}{6} = \dfrac{5}{90} or \dfrac{1}{18}$

8.) $10 \dfrac{2}{3}$
$\dfrac{3}{8} \div 4$
$= \dfrac{8}{3} \times \dfrac{4}{1} = \dfrac{32}{3} or 10 \dfrac{2}{3}$

9.) $\dfrac{12}{25}$
$1 \dfrac{2}{3} \div \dfrac{4}{5}$
$= \dfrac{5}{3} \div\dfrac{4}{5}$
$= \dfrac{3}{5} \times \dfrac{4}{5} = \dfrac{12}{25}$

10.) $\dfrac{1}{58}$
$7 \dfrac{1}{4} \div \dfrac{1}{8}$
$= \dfrac{29}{4} \div \dfrac{1}{8}$
$= \dfrac{4}{29} \times\dfrac{1}{8} = \dfrac{4}{232} or \dfrac{1}{58}$

You might also like: Multiplication and Division of Fractions Exercises – Set 1

## Subtraction of Fractions Exercises – Set 2

Find the difference of the following:

1.) $\dfrac{9}{11} - \dfrac{7}{11}$

2.) $\dfrac{10}{21} - \dfrac{3}{21}$

3.) $\dfrac{40}{15} - \dfrac{10}{15}$

4.) $9 \dfrac{3}{10} - \dfrac{7}{10}$

5.) $\dfrac{1}{2} - \dfrac{1}{5}$

6.) $7 - \dfrac{3}{5}$

7.) $5 \dfrac{7}{8} - \dfrac{3}{4}$

8.) $9 \dfrac{1}{2} - 7 \dfrac{1}{5}$

9.) $6 \dfrac{1}{5} - 2 \dfrac{3}{4}$

10.) $12 \dfrac{1}{6} - 3 \dfrac{1}{2}$

Solution:

1.) $\dfrac{2}{11}$
2.) $\dfrac{7}{21} = \dfrac{1}{3}$
3.) 2
4.) $8 \dfrac{9}{10}$
Solution:
LCD: 10
$9 \dfrac{3}{10} - \dfrac{7}{10} = 8 \dfrac{10}{10} + \dfrac{3}{10} - \dfrac{7}{10} = 8 \dfrac{13}{10} - \dfrac{7}{10} = 8 \dfrac{6}{10} = 8 \dfrac{3}{5}$

5.) $\dfrac{3}{10}$
Solution:
LCD: 10
$\dfrac{5}{10} - \dfrac{2}{10} = \dfrac{3}{10}$

6.) $6 \dfrac{2}{5}$
Solution:
$6 \dfrac{5}{5} - \dfrac{3}{5} = 6 \dfrac{2}{5}$

7.) $5 \dfrac{1}{8}$
Solution:
LCD: 8
$5 \dfrac{7}{8} - \dfrac{6}{8} = 5 \dfrac{1}{8}$

8.) $2 \dfrac{3}{10}$
Solution:
LCD: 10
$9 \dfrac{5}{10} - 7 \dfrac{2}{10} = 2 \dfrac{3}{10}$

9.) $3 \dfrac{9}{20}$
Solution:
LCD: 20
$6 \dfrac{4}{20} - 2 \dfrac{15}{20} = 5 \dfrac{24}{20} - 2 \dfrac{15}{20} = 3 \dfrac{9}{20}$

10.) $8 \dfrac{2}{3}$

Solution:
LCD: 6
$12 \dfrac{1}{6} - 3 \dfrac{3}{6} = 11 \dfrac{7}{6} - 3 \dfrac{3}{6} = 8 \dfrac{4}{6} = 8 \dfrac{2}{3}$

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## Addition of Fractions Exercises – Set 2

1.) $\dfrac{1}{7} + \dfrac{2}{7}$

2.) $\dfrac{1}{12} + \dfrac{5}{12}$

3.) $\dfrac{7}{15} + \dfrac{2}{15} + \dfrac{6}{15}$

4.) $\dfrac{1}{3} + \dfrac{1}{4}$

5.) $\dfrac{2}{9} + \dfrac{1}{3}$

6.) $\dfrac{3}{8} + \dfrac{1}{4}$

7.) $8 \dfrac{2}{3} + \dfrac{3}{2}$

8.) $\dfrac{1}{2} + \dfrac{2}{3} + \dfrac{3}{4}$

9.) $7 \dfrac{2}{7} + 6 \dfrac{3}{14}$

10.) $3 \dfrac{1}{4} + 2 \dfrac{1}{8}$

1.) $\dfrac{3}{7}$

2.) $\dfrac{6}{12} = \dfrac{1}{2}$

3.) $\dfrac{15}{15} = 1$

4.) $\dfrac{7}{12}$
Solution:
LCD: 12
$\dfrac{4}{12} + \dfrac{3}{12} = \dfrac{7}{12}$

5.) $\dfrac{5}{9}$
Solution:
LCD: 9
$\dfrac{2}{9} + \dfrac{3}{9} = \dfrac{5}{9}$

6.) $\dfrac{5}{8}$
Solution:
LCD: 8
$\dfrac{3}{8} + \dfrac{2}{8} = \dfrac{5}{8}$

7.) $10 \dfrac{1}{6}$
Solution:
LCD: 6

$8 \dfrac{4}{6} + \dfrac{9}{6} = 8 \dfrac{13}{6} = 10 \dfrac{1}{6}$

8.) $1 \dfrac{11}{12}$
Solution:
LCD: 12

$\dfrac{6}{12} + \dfrac{8}{12} + \dfrac{9}{12} = \dfrac{23}{12} = 1 \dfrac{11}{12}$

9.) $13 \dfrac{1}{2}$

Solution:
LCD: 14

$7 \dfrac{4}{14} + 6 \dfrac{3}{14} = 13 \dfrac{7}{14} = 13 \dfrac{1}{2}$

10.) $5 \dfrac{3}{8}$

Solution:
LCD: 8

$3 \dfrac{2}{8} + 2 \dfrac{1}{8} = 5 \dfrac{3}{8}$

## Conversion of Units Part 1: Centimeters, Meters, Kilometers

Converting from one unit to another is one of the skills that you should learn before taking the Civil Service Examinations. It sometimes makes calculations easier and therefore saves time.

In this series, I will discuss the different methods that can be used in converting from one unit to another. I will illustrate several examples such as conversion among centimeters (cm), meters (m) and kilometers (km). Take note that the methods used here can also be used in conversion of other units of measure.

It is important that you memorize some standard conversions such as the following:

1 m = 100 cm

1 km = 1000 m

1 kg = 1000 g

1 ft = 30 cm

1 ft = 12 inches

1 mile = 1.6 km  » Read more

## Multiplication and Division of Fractions Exercises – Set 1

Week 4

1. 3/4 x 1/2

2. 2/7 x 7/10

3. 4 1/5 x 2/3

4. 8 x 3/4

5. 1 2/3 x 2 3/4 x 11/12

6. 2/5 ÷ 4/5

7. 3/4 ÷ 8

8. 9 ÷ 3/4

9. 5 1/6 ÷ 3/31

10. 2 5/6 ÷ 4 3/5

1. 3/8 3/4 x 1/2 = 3/8

2. 1/5

Solution

2/7 x 7/10 = 14/70 = 1/5

3. 2 4/5

Solution

4 1/5 x 2/3
= 21/5 x 2/3 = 42/15
= 2 12/15 = 2 4/5

4. 6

Solution

8 x 3/4 = 8/1 x 3/4
= 24/4 = 6

5. 4 29/144

Solution
1 2/3 x 2 3/4 x 11/12
= 5/3 x 11/4 x 11/12
= 605/144
= 4 29/144

6. 1/2

Solution

2/5 x 5/4 = 10/20 = 1/2

7. 3/32

Solution
3/4 ÷ 8
= 3/4 x 1/8
= 3/32

8. 12

Solution

9 ÷ 3/4 = 9/1 x 4/3 = 36/3 = 12

9. 5 1/6 ÷ 31/3
= 31/6 x 3/31
= 961/18 = 53 7/18

10. 8/35

2 5/6 ÷ 4 3/5 = 17/6 ÷ 23/5
= 17/6 x 5/23 = 85/138

You might also like: Multiplication and Division of Fractions Exercises – Set 1

## Subtraction of Fractions Exercises – Set 1

Find the difference of the following:

1.) $\dfrac{8}{11} - \dfrac{3}{11}$

2.) $\dfrac{7}{16} - \dfrac{3}{16}$

3.) $\dfrac{4}{5} - \dfrac{3}{4}$

4.) $7 - \dfrac{4}{9}$

5.) $8 \dfrac{9}{10} - \dfrac{3}{10}$

6.) $6 \dfrac{2}{7} - \dfrac{5}{7}$

7.) $4 \dfrac{1}{3} - \dfrac{1}{6}$

8.) $6 \dfrac{3}{5} - 2 \dfrac{3}{4}$

9.) $11 \dfrac{2}{3} - 7$

10.) $9 \dfrac{2}{5} - \dfrac{11}{9}$

1.) $\dfrac{5}{11}$

2.) $\dfrac{1}{4}$

Solution
$\dfrac{7}{16} - \dfrac{3}{6} = \dfrac{4}{16} = \dfrac{1}{4}$

3.) $\dfrac{1}{20}$

Solution
LCD: 20
$\dfrac{4}{5} - \dfrac{3}{4} = \dfrac{16}{20} - \dfrac{15}{20} = \dfrac{1}{20}$

4.) $6 \dfrac{5}{9}$

Solution

We can decompose 7 into 6 and 9/9.

$6 \dfrac{9}{9} - \dfrac{4}{9} = 6 \dfrac{5}{9}$

5.) $8 \dfrac{3}{5}$

Solution
$8 \dfrac{9}{10} - \dfrac{3}{10} = 8 \dfrac{6}{10} = 8 \dfrac{3}{5}$

6.) $5 \dfrac{4}{7}$

Solution
$5 \dfrac{9}{7} - \dfrac{5}{7} = 5 \dfrac{4}{7}$

7.) $4 \dfrac{1}{6}$

Solution
LCD: 6
$4 \dfrac{1}{3} - \dfrac{1}{6} = 4 \dfrac{2}{6} - \dfrac{1}{6} = 4 \dfrac{1}{6}$

8.) $3 \dfrac{17}{20}$

Solution
LCD: 20
$5 \dfrac{8}{5} - 2 \dfrac{3}{4} = 5 \dfrac{32}{20} - 2 \dfrac{15}{20} = 3 \dfrac{17}{20}$

9.) $4 \dfrac{2}{3}$

Solution
$11 \dfrac{2}{3} - 7 = 4 \dfrac{2}{3}$

10.) $8 \dfrac{8}{45}$

Solution
$9 \dfrac{2}{5} - \dfrac{11}{9} = 8 \dfrac{7}{5} - \dfrac{11}{9}$

LCD: 45
$8 \dfrac{63}{45} - \dfrac{55}{45} = 8 \dfrac{8}{45}$

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## Addition of Fractions Exercises – Set 1

Find the sum of the following.

1. 1/8 + 2/8 + 3/8
2. 2/5 + 1/4
3. 5/8 + 7/12
4. 1/15 + 3/5 + 1/3
5. 4 + 3/5
6. 2 1/3 + 1/2
7. 3 3/4 + 7/10
8. 6 1/5 + 2 7/15 + 1/3
9. 3 + 7 1/8 + 4/5
10. 9 1/2 + 11/3

1. 3/4

2. 13/20
LCD: 20
8/20 + 5/20 = 13/20

3. 1 1/6
LCD: 24
15/24 + 14/24 = 29/24 = 1 5/24

4. 1
LCD: 15
1/15 + 9/15 + 5/15 = 15/15 = 1

5. 4 3/5
4 3/5

6. 2 5/6
LCD: 6
2 2/6 + 3/6 = 2 5/6

7. 4 9/20
LCD: 20
3 15/20 + 14/20
= 3 29/20 = 4 9/20

8. 9
LCD: 15
6 3/15 + 2 7/15 + 5/15
= 8 15/15 = 9

9. 10 37/40
LCD: 40
3 + 7 5/40 + 32/40
= 10 37/40

10. 13 1/6
LCD: 6
9 3/6 + 22/6
= 9 25/6 or 13 1/6

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