4 Operations of Decimals

Adding

100

.28 + .4 = 

.68

200

.209 + 3.907 =

4.116

300

250.6 +9.873

260.473

400

A dog weighs 12.8 kg and a cat weighs 3.57 kg. How much do the animals weigh altogether?

16.37 kg

500

Sloan has $8.40. Caroline S. has 3.5 times as much money as Sloan. How much money do they have altogether?

$ 8.40 x 3.5 = $29.40

$29.40 + $8.40 = $37.80

$37.80

Subtraction

100

2.45-.342 =

2.108

200

.35 - .154

.196

300

Subtract 7.261 from 31.48

24.219

400

Lulie had 4.5m of ribbon. She used 1.2 m of the ribbon to make crafts for Dr. Seuss day and 2.25m to make bows. How many meters of ribbon did she have left?

4.5 - 1.2 -2.25 = 1.05m

1.05m

500

8 - .006

7.994

Multiplication

100

86 x .9 =

77.4

200

.3 x .9

= .27

300

45.45 x .1

4.545

400

385.4 x .86

331.444

500

1 cup of sugar weighs .18kg. What is the weight of .1 cup of sugar in kilograms?

.18 x.1 = .018 kg

Division

100

9 ÷ 4 =

2.25

200

6 ÷ .01

600

300

Divide 38 by .3 . Express the quotient correct to the first decimal place. 

126.7

400

Express the quotient that has 3 or more decimals correct to the second decimal place.

80 ÷ 2.3 =

34.78

500

There was 3.5 L of iced tea in a jug. Clark spilled .04 L of it. He then poured the remaining tea equally into 4 glasses. How many liters of water were in each glass? Express the answer to the first decimal place. 

3.5 L - .04 L = 3.46L

3.46L ÷ 4 = .865 L

=.9 L

Mixed Up

100

72 ÷ .1

720

200

10 + .23 + 1.807

12.037

300

Express 2/9 as a decimal correct to the second decimal place. 

.22

400

Skylar has 12 lb of cookies. She wants to fill bags so that each contain .25 lbs of cookies. How many bags can she fill? 

12 ÷ .25 = 48 bags

500

Morgan had .95 kg of white beads, 11.07 kg of red beads, and 5.4 of black beads mixed in a bag. How many kilograms of beads were in the bag?

.95 + 11.07 + 5.4 = 17.42 kg