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Decimals

How to add and subtract with decimals:

Step 1: Write vertically and line decimals up in a straight line.

Step 2: Fill in any empty places with zeros.

Step 3: Either Add or Subtract

2.05

+ 7.90

9.95

3.5 + 1.25

a. 4.25

b. 3.75

c. 4.35

d. 4.75

e. 4.15

15.74 + 7.025

a. 22.765

b. 23.125

c. 24.375

d. 21.525

e. 22.625

45.9 + 763.824

a. 890.742

b. 809.324

c. 908.427

d. 810.274

e. 809.724

452.36 + 1023.86

a. 1475.35

b. 1476.22

c. 1674.22

d. 1476.35

e. 1475.33

3.05 - 2.3

a. 0.35

b. 1.05

c. 0.75

d. 0.075

e. 1.75

4.5 - 3.04

a. 1.76

b. 0.96

c. 1.46

d. 1.56

e. 2.06

145.236 - 95.638

a. 50.098

b. 49.598

c. 49.958

d. 51.852

e. 48.238

56.351 - 23.6851

a. 31.2359

b. 29.0676

c. 30.5569

d. 32.6659

e. 29.7763

23.2 + 52.364 + 56.003

a. 130.765

b. 131.567

c. 132.056

d. 130.367

e. 131.657

102.3-0.003-78.365

a. 22.978

b. 23.652

c. 23.932

d. 22.392

e. 21.369

How to multiply with decimals:

Step 1: Multiply like normal. Feel free to write vertically if it is more comfortable for you.

Step 2: Count the number of places (from right to left) to where the decimal is located in both the numbers you multiplied.

Step 3: Move the decimal the same number of places in your answer.

3.5 x 2.3

a. 6.15

b. 5.08

c. 8.05

d. 8.15

e. 7.8

0.23 x 2.65

a. 0.6095

b. 0.9065

c. 1.6095

d. 60.95

e. 2.6095

0.96 x 3.678

a. 2.53

b. 4.653

c. 3.859

d. 3.35

e. 3.53

2.35 x 1.234

a. 2.7

b. 2.9

c. 1.9

d. 2.3

e. 2.1

1.56 x 3

a. 5.86

b. 4.68

c. 5.68

d. 4.56

e. 3.56

15.23 x 72.3

a. 1101.921

b. 1111.657

c. 1001.921

d. 1101.129

e. 1111.129

4 x 23.658

a. 91.6

b. 92.8

c. 94.3

d. 95.8

e. 94.6

21.5 x 1.4

a. 29.8

b. 30.1

c. 30.5

d. 31.2

e. 30.9

15.3 x 0.123

a. 3.6

b. 8.7

c. 1.9

d. 15.6

e. 5.9

0.23 x 2.5 x 1.68

a. 3.92

b. 1.95

c. 0.97

d. 0.57

e. 3.48

How to divide with decimals:

Division ( 2 types of problems)

Identify if the decimal is in the first, second or both numbers.

*If the decimal is in the first number only follow the instructions below.

Step 1: Write the division problem in customary form.

Step 2: Move the decimal straight up above the division bar.

Step 3: Ignore the decimal and divide like normal.

*If the decimal is located in the second number only or if it is in both numbers follow the instructions below.

Step 1: Write the division problem in customary form.

Step 2: Move the decimal on the outside to the right until it is a whole number.

Step 3: Move the decimal on the inside the same number of places.

Step 4: Move the decimal straight up above the division bar.

Step 5: Ignore the decimal and divide like normal.

This video shows how to divide with decimals.

embeded media indicator

20.5 ÷ 4

a. 5.625

b. 20.625

c. 25.125

d. 51.25

e. 5.125

15.35 ÷ 5

a. 30.70

b. 7.30

c. 7.03

d. 3.07

e. 3.70

12.5 ÷ 3

a. 4.167

b. 41.67

c. 42.67

d. 6.247

e. 4.5

23.6 ÷ 6

a. 9.39

b. 3.93

c. 39.3

d. 30.9

e. 9.03

125.5 ÷ 5

a. 2.51

b. 25.1

c. 5.25

d. 2.51

e. 0.251

20 ÷ 0.4

a. 5

b. 25

c. 50

d. 500

e. 0.5

30.7 ÷ 0.25

a. 122.8

b. 12.28

c. 8.221

d. 1.228

e. 2.218

15 ÷ 0.15

a. 15

b. 10

c. 1

d. 100

e. 1000

13.6 ÷ 0.22

a. 1.682

b. 2.168

c. 0.6182

d. 61.82

e. 6.182

1.0236 ÷ 4.2

a. 0.422

b. 4.24

c. 2.44

d. 24.4

e. 0.244

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