Write/Identify the Ratio
There are 4 red apples and 6 green apples.
Write the ratio of red apples to green apples.
4:6
Are 2:3 and 4:6 equivalent?
YES (×2)
3:4 = 6 : ___
6:8
(x by 2)
$16 for 4 notebooks
What is the cost per notebook?
16 ÷ 4 = $4 per notebook
A recipe calls for sugar and flour in a ratio of 1:3.
If you use 6 cups of sugar, how much flour is needed?
6 cups sugar = 1 part × 6
Flour = 3 × 6 = 18 cups
A class has 12 boys and 15 girls.
Write the ratio of girls to boys in colon form and fraction form.
15:12 and 15/12
Write two equivalent ratios for 5:7
multiplication
5:8 = ___ : 24
15:24
8 × 3 = 24
5 × 3 = 15
240 km in 4 hours
What is the speed per hour?
240 ÷ 4 = 60 km/h
A car travels 360 km in 6 hours.
What is the unit rate? How far will it travel in 9 hours?
Unit rate: 360 ÷ 6 = 60 km/h
In 9 hours: 60 × 9 = 540 km
In a jar, there are 18 blue marbles, 9 yellow marbles, and 3 red marbles.
Write the ratio of:
a) blue to yellow
b) red to total marbles
a) 18:9
b) 3:30
Are 6:8 and 9:12 equivalent?
YES
6:8 = 3:4
9:12 = 3:4
7:9 = 21 : ___
21:27
7 × 3 = 21
9 × 3 = 27
3.5 kg of apples cost $10.50
What is the cost per kilogram?
10.50 ÷ 3.5 = $3 per kg
The ratio of boys to girls in a club is 2:3.
There are 20 students in total.
How many are girls?
Total parts = 2 + 3 = 5 parts
20 ÷ 5 = 4 students per part
Girls = 3 × 4 = 12 girls
A recipe uses 2 cups of oil for every 5 cups of flour.
Write the ratio of oil to flour.
2:5
Create an equivalent ratio to 4:9 using the multiple 5
20:45
2.5 : 5 = 5 : ___
5:10
2.5 x 2 = 5
5 × 2 = 10
A factory produces 1,200 bottles in 8 hours.
How many bottles per hour?
1200 ÷ 8 = 150 bottles per hour
A store sells 12 pencils for $4.80.
Another store sells 18 pencils for $6.30.
Which store has the better deal? Show your reasoning.
Store 1: 4.80 ÷ 12 = $0.40 per pencil
Store 2: 6.30 ÷ 18 = $0.35 per pencil
Store 2 is the better deal
In a school, the ratio of students who walk to school to students who take the bus is 3:4.
If 84 students walk, how many take the bus?
84:112
Determine if 3:5 and 18:25 are equivalent.
NOT equivalent
3 × 6 = 18
5 × 6 = 30 (not 25)
The ratio of boys to girls is 4:7.
If there are 56 girls, how many boys are there?
56 girls = 7 parts
56 ÷ 7 = 8 per part
4 × 8 = 32 boys
A runner travels 84 km in 7 hours.
What is the speed per hour?
84 ÷ 7 = 12 km per hour
A water tank fills at a constant rate of 15 litres every 4 minutes.
a) What is the unit rate (litres per minute)?
b) How many litres will fill in 20 minutes?
a) 15 ÷ 4 = 3.75 litres per minute
b) 3.75 × 20 = 75 litres