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CanadaON
Grade 7

3.08 Decimals in the real world

Worksheet
Applications
1

Round the following to the nearest cent:

a

\$34.7691

b

\$64.4725

c

\$254.899

d

\$32.455

2

Round the following to the nearest five cents:

a

\$27.82

b

\$64.86

c

\$34.89

d

\$57.54

e

\$227.02

f

\$634.67

g

\$1024.98

h

\$21.94

3

Harry buys an item from the school canteen for \$3.20. If he pays for it with a five dollar bill, how much change will he get back?

4

A customer gives the cashier \$100 to pay for a purchase of \$64.95. How much change should the cashier give the customer?

5

Amy is buying some supplies for the new school year. She buys a notebook for \$9.55, a pack of pens for \$6.12 and a pencil case for \$6.28. How much does she spend in total?

6

A calculator is 15.9 \text{ cm} long.

a
How far will 30 calculators reach if laid end to end?
b

Convert this length to metres.

7

Lisa purchased a car and is paying monthly installments of \$148.40 to pay it off. If it takes her 60 months to pay it off, how much will she have spent on car repayments in total?

8

James used a calculator to evaluate 3.179 \times 3.96 but forgot to enter the decimal points. The answer he got was 1\,258\,884. What should the answer have been?

9

If Skye earns \$238.42 for working 7 hours, how much does she earn per hour?

10

Three items weighing 1.22 \text{ kg}, 4.66 \text { kg} and 2.77 \text{ kg} are to be mailed but are found to be over the 8.11 \text{ kg} limit. By how much does the total weight exceed the limit?

11

A piece of timber 3.32 \text{ m} long is cut evenly into smaller pieces each measuring 0.04 \text { m}. How many of these pieces can be cut?

12

Quentin recorded the following times in the 100 \text{ m} running race over a whole season.

How much quicker was his fastest time than his slowest time?

RaceTime (seconds)
110.59
211.03
310.45
410.38
510.63
13

How many 0.38 \text{ L} bottles can be filled from a barrel which holds 41.8 \text{ L}?

14

How much would you pay for eight t-shirts if they cost \$46.88 each, and you receive a discount of \$9.47 off of the total price?

15

Neville trains six days a week. Each weekday, he runs 2.4 \text{ km} and on Saturday, he runs 4.6 \text{ km}. How far does he run in a whole week?

16

At midnight, the temperature in Ottawa is 24.6 \degree \text{C}. Each hour after that the temperature decreases by 2.34 \degree \text{C} until the sun comes up. Find the temperature at 4 am and explain the process you used.

17

Pauline is making 5 chocolate coated strawberries for her friends. She has 52.5\text{ g} of chocolate which she uses to evenly coat the strawberries.

a

One of the strawberries has a mass of 19\text{ g}. Choose the most reasonable estimate for its mass once it is coated in chocolate:

A

29\text{ g}

B

69\text{ g}

C

9\text{ g}

D

10\text{ g}

b

Calculate the exact mass of the 19\text{ g} strawberry after it is coated in chocolate.

18

William earns \$304.92 for 5 days of work.

a

Choose the most reasonable estimate for how much William earns per day:

A

\$6.10

B

\$610.00

C

\$61.00

D

\$152.50

b

Calculate how much William earns each day.

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Outcomes

7.B2.1

Use the properties and order of operations, and the relationships between operations, to solve problems involving whole numbers, decimal numbers, fractions, ratios, rates, and percents, including those requiring multiple steps or multiple operations.

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