Grade 6 · Math · Unit 5 of 14
Percents & Ratios
Mental percents, ratios and rates
What your child practises
Finding 1%, 5%, 10%, 15%, 25% and 50% of a number in your head, and solving ratio, rate and percent problems.
Ontario Curriculum expectation: B2.3, B2.12 · percents of whole numbers using mental math, ratios, rates and percent problems
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
What is 5% of 160?
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8
Hint: Find 10%, then halve it.
Question 2
What is 15% of 100?
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15
Hint: Find 10% and 5%, then add them.
Question 3
A game costs $80. It is 25% off. What is the sale price in dollars?
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60
Hint: Find 25% of the price, then take it away.
Question 4
A cyclist rides 28 km in 4 hours. At the same rate, how far does the cyclist ride in 6 hours?
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42
Hint: First find the rate: 28 ÷ 4 = 7 km per hour.
Question 5
In a class, the ratio of girls to boys is 3 to 4. There are 49 students. How many are girls?
Girls Boys Total 3 4 7 ? 49 answer box
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21
Hint: There are 7 parts. Each part is 49 ÷ 7 = 7 students.
Question 6
Jay got 2 out of 4 questions right. What percent is that?
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50 %
Hint: Write 2/4 as a fraction out of 100.