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11.02 Simplify ratios

Worksheet
Ratios as fractions
1

Write the following ratios as fractions in simplest form:

a
20 \text{ to } 25
b
54 \text{ to } 24
c
75 \text{ to } 90
d

\$179 \text{ to } \$449

e

5.4 \text{ to } 7.2

f

0.6 \text{ to } 2.4

g

45 hours to 40 hours

h

3 hours and 30 minutes to 5 hours

i

\$1.90 \text{ to } \$8.40

j

6\dfrac{1}{4} \text{ to } 9\dfrac{3}{8}

2

Write the following fractions as ratios of integers:

a
\dfrac{7}{35}
b
\dfrac{11}{8}
c
1\dfrac{2}{5}
d
3\dfrac{2}{5}
3

The ratio \dfrac{2}{3} means the same thing as the ratio \dfrac{3}{2}. Is this statement true or false? Explain your answer.

Equivalent and simplified ratios
4

Simplify the following ratios:

a

48:135

b
7:28
c
7:35
d
42:7
e
46:58
f
10:24
g
18:30
h
400:160
5

Simplify the following ratios:

a
4.2:4.5
b

5.4:0.75

c
0.1:0.05
d
0.9:7.2
6

Simplify the following ratios:

a
\dfrac{3}{7} : \dfrac{8}{7}
b
\dfrac{6}{2} : \dfrac{8}{10}
c
\dfrac{3}{4}:2
d

\dfrac{2}{7}:\dfrac{5}{7}

e

\dfrac{4}{7}:\dfrac{8}{5}

f

\dfrac{1}{5}:\dfrac{9}{7}

g

\dfrac{20}{3}:4

h

\dfrac{4000}{10\,000}:\dfrac{3000}{10\,000}

i

5\dfrac {2}{5}:6

j

1\dfrac {5}{7}: 1\dfrac {9}{11}

7

Simplify the following ratios:

a

6 seconds to 18 seconds

b

3 minutes to 70 seconds

c

28 hours to 5 days

d

5 years to 33 months

8

Simplify the following ratios:

a

40 minutes to 4 hours

b

\dfrac{18}{25} \text{ kg} to 230 \text{ g}

c

\dfrac{6}{7} of an hour to 2\dfrac{1}{2} hours

d

\$0.60 to \$2.20

e

3.8 \text{ kg} to 180 \text{ g}

9

Consider the ratio \dfrac{2}{5} to \dfrac{16}{25}.

a

What number should be multiplied to both sides of the ratio to cancel out the denominators?

b

Write the ratio \dfrac{2}{5} to \dfrac{16}{25} as a simplified ratio.

c

Hence, write the ratio \dfrac{2}{5} to \dfrac{16}{25} as a fraction in simplified form.

10

For each pair of quantities:

i

Rewrite the two quantities in the same units as whole numbers.

ii

Write the pair of quantities as a simplified ratio.

a

50 cents to \$2.10

b

105 cents to \$1.20

11

For the following, complete the patterns of equivalent ratios by filling in the gaps:

a
\begin{aligned} 2 &: 3 \\ ⬚ &: ⬚ \\ 6 &: 9 \\ 8 &: 12\\ 10 &: ⬚ \end{aligned}
b
\begin{aligned} ⬚ &: 20 \\ 4 &: 16 \\ ⬚ &: 12 \\ ⬚ &: 8\\ 1 &: 4 \end{aligned}
c
\begin{aligned} 18 &: 27 \\ ⬚ &: 21 \\ 10 &: 15 \\ 6 &: ⬚ \\ 2 &: ⬚ \end{aligned}
12

For each of the following ratios:

i

Write the ratio as a simplified ratio.

ii

Write the ratio as a percentage. Round to the nearest percent if necessary.

a

12 pears to 36 pears.

b

65 newtons to 100 newtons.

c

3 centuries to 1000 years.

d

15 eggs to 3 dozen eggs.

e

18 weeks to 1 year (Assume 1 year has 52 weeks).

Applications
13

Amelia and Harry scored goals in their netball game in the ratio 4:3.

a

What fraction of the total number of goals were scored by Amelia?

b

What fraction of the total number of goals were scored by Harry?

c

What percentage of the total number of goals were scored by Amelia? Round your answer to the nearest percent.

14

The table shows the amount of several ingredients in a pack of 150-gram biscuits:

a

Write the ratio of sugar to fat as a fraction in simplest form.

b

Write the ratio of milk to wheat as a fraction in simplest form.

c

Find the ratio of sugar to fat as a whole percentage.

d

Find the ratio of milk to wheat as a whole percentage.

Number of grams in one pack of biscuits:

\text{Fat}\text{15 grams}
\text{Sugar}\text{12 grams}
\text{Milk}\text{18 grams}
\text{Wheat}\text{16 grams}
15

The table shows the amount of several ingredients in a pack of 300-gram biscuits:

a

Write the ratio of milk to sugar as a fraction in simplest form.

b

Write the ratio of salt to wheat as a fraction in simplest form.

c

Find the ratio of milk to sugar as a percentage. Round your answer to the nearest percent.

d

Find the ratio of salt to wheat as a percentage. Round your answer to the nearest percent.

Number of grams in one pack of biscuits:

\text{Sugar}\text{14 grams}
\text{Milk}\text{18 grams}
\text{Wheat}\text{15 grams}
\text{Salt}\text{12 grams}
16

A bottle contains 18 \text{ mL} of chlorine and 30 \text{ mL} of fluoride.

a

Write the ratio of chlorine to fluoride as a fraction in simplest form.

b

Write the ratio of fluoride to chlorine as a fraction in simplest form.

c

Find the ratio of chlorine to fluoride as a percentage. Round your answer to the nearest percent.

d

Find the ratio of fluoride to chlorine as a percentage. Round your answer to the nearest percent.

17

The Darwin Dingos had 29 wins and 11 losses in their season.

a

Write the ratio of wins to losses as a fraction in simplest form.

b

Write the ratio of losses to wins as a fraction in simplest form.

c

Find the ratio of wins to losses as a percentage. Round your answer to the nearest percent.

d

Find the ratio of losses to wins as a percentage. Round your answer to the nearest percent.

18

A number of building blocks are shared between Elizabeth and Tobias in the ratio 4:3.

a

Write the total number of parts in the ratio.

b

What fraction of the blocks does Elizabeth receive?

c

What fraction of the blocks does Tobias receive?

19

The following table shows the ratio of dogs to cats:

a

Complete the table of equivalent ratios.

b

If there are 270 dogs, how many cats would there be?

c

Simplify the ratio of the number of dogs to cats from part (b).

DogstoCats
9:5
18:10
27:
45:
:50
20

My grandmother's recipe for fruit punch states that 5 cups of apple juice should be mixed with a \dfrac{4}{5} of a cup of lemonade.

Complete the table:

Apple JuiceLemonade
5\dfrac{4}{5}
10\dfrac{8}{5}
15\dfrac{12}{5}
20
25
21

To make 3 cups of rice, Ben needs 5 cups of water. To make 15 cups of rice, he needs 25 cups of water. Write this as a proportion by filling in the blanks below:

\dfrac{3 \text{ cups rice}}{⬚ \text{ cups water}}= \dfrac{⬚ \text{ cups rice}}{⬚ \text{ cups water}}
22

A journalist spent a total of 24 hours researching, writing and editing a news report. She spent 14 hours researching and 6 hours writing.

a

How many hours did she spend editing the report?

b

Write the ratio of time researching to writing in simplest form.

c

Write the ratio of time writing to editing in simplest form.

d

Write the ratio of time researching to editing in simplest form.

e

Find, in simplest form, the ratio in which her time was divided between researching, writing and editing.

23

Jimmy is making a patterned lid for a wooden chest. He knows that for every \dfrac{1}{2} metres of mahogony he needs 40 centimetres of oak.

a

Write the ratio of mahogony to oak in three different ways.

b

How many metres of mahogony would Jimmy need if he wants to use 6 metres of oak?

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Outcomes

2.3.3

understand the relationship between simple fractions, percentages and ratio, for example, a ratio of 1:4 is the same as 20% to 80% or 1/5 to 4/5

2.3.4

express a ratio in simplest form

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