Grade 8 · Math · Unit 4 of 10
Percents & Money
Discounts, tax, budgets and change
What your child practises
Finding a percent of a number, moving between fractions, decimals and percents, sale prices and sales tax (BC's 12%), simple monthly budgets, and making change.
Newfoundland and Labrador Curriculum curriculum outcome: Number sense and number theory (by Grade 9) · percents greater than 100 and less than 1, and money problems
How we explain it
Children can open this short lesson before they practise.
- A percent can be more than 100% or less than 1%.
- Percent of a number: change the percent to a decimal and multiply.
- A budget compares money in with money out.
Example: What is 150% of 40? 150% = 1.5. 1.5 × 40 = 60. Answer: 60
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 30% of 80?
answer box
24
Hint: 30% = 30/100. 30/100 × 80 = 24.
Question 2
24 out of 40 students walk to school. What percent walk?
answer box%
60 %
Hint: Part ÷ whole = 24 ÷ 40 = 0.6, which is 60%.
Question 3
What is 0.5% of 4000?
answer box
20
Hint: 0.5% is half of 1%. 1% of 4000 is 40, so 0.5% is 20.
Question 4
Which percent is equal to 3/4?
- 75%
- 70%
- 20%
- 37.5%
75%
Hint: 3/4 = 0.75 as a decimal, and 0.75 × 100 = 75%.
Question 5
A jacket costs $20. It is on sale for 50% off. What is the sale price, in dollars?
answer box
10
Hint: 50% of 20 is 10. Subtract: 20 − 10 = 10.
Question 6
A bike helmet costs $150 before tax. The tax rate is 12% (GST 5% plus PST 7%). How much is the total, in dollars?
answer box
168
Hint: Tax = 12% of 150 = 18. Total = 150 + 18 = 168.