for Whoobee's shop
Grade 7 Quiz: Decimals & Percents — Easy Version 1
Grade 7 · Whoobee Name: ____________________ Date: __________
Answer every question. The lesson name before each question tells you which skill it checks — open that lesson if you need a reminder.
How to solve
This quiz mixes questions from different lessons, like a real test. Read each question carefully: the lesson name in front tells you what kind of problem it is. Check your answers, then practise the lessons where you made mistakes.
Example
Discount and Sale Price: A printer costs $160. It is on sale for 50% off. What is the sale price?
Answer: $80.00
Not quite. The answer is
💡 10 has 1 zero, so divide by moving the decimal point 1 place to the left. 21.0 ÷ 10 = 2.10.
✓ Correct!
Not quite. The answer is
💡 10 has 1 zero, so divide by moving the decimal point 1 place to the left. 21.0 ÷ 10 = 2.10.
💡 How to solve: Multiplying & Dividing Decimals by 10, 100, and 1,000 (Mixed Review)
Count the zeros in 10, 100, or 1,000. When multiplying, move the decimal point that many places to the right; when dividing, move it that many places to the left, adding zeros if needed.
Try a similar one
9.6 × 10 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Profit is the selling price minus the cost: 92 − 80 = 12. The profit is $12.
✓ Correct!
Not quite. The answer is
💡 Profit is the selling price minus the cost: 92 − 80 = 12. The profit is $12.
💡 How to solve: Profit & Loss: Percent Profit
Profit = selling price - cost; loss = cost - selling price. Percent profit (or loss) = profit (or loss) ÷ cost × 100. To sell at a 20% profit, add 20% of the cost to the cost; at a 20% loss, subtract it.
Try a similar one
A shop buys a painting for $140 and sells it for $182. How many dollars of profit does it make?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Use I = P × r × t and solve for t: t = I ÷ (P × r). Write the rate as a decimal: 2% = 0.02. One year earns P × r = 200 × 0.02 = 4. t = 16 ÷ 4 = 4. The money was invested for 4 years.
✓ Correct!
Not quite. The answer is
💡 Use I = P × r × t and solve for t: t = I ÷ (P × r). Write the rate as a decimal: 2% = 0.02. One year earns P × r = 200 × 0.02 = 4. t = 16 ÷ 4 = 4. The money was invested for 4 years.
💡 How to solve: Simple & Compound Interest
Simple interest is I = P × r × t: the principal P, times the yearly rate r written as a decimal, times the time t in years. $800 at 5% for 3 years earns 800 × 0.05 × 3 = $120, so the total is 800 + 120 = $920.00. To find the rate or the time, divide the interest by the other two numbers: r = I ÷ (P × t) and t = I ÷ (P × r). Write months as part of a year (6 months = 0.5 year). Compound interest also earns interest on the interest: multiply by (1 + r) once for each year. $1,000 at 10% is 1,000 × 1.1 × 1.1 = $1210.00 after 2 years.
Try a similar one
Jamal puts $600 in an account that earns 10% simple interest each year. How much interest does the account earn in 2 years?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Find the tax. Change 4% to a decimal: 4% = 0.04. Multiply: 0.04 × 27 = 1.08. Add it to the price: 27 + 1.08 = 28.08. The total cost is $28.08.
✓ Correct!
Not quite. The answer is
💡 Find the tax. Change 4% to a decimal: 4% = 0.04. Multiply: 0.04 × 27 = 1.08. Add it to the price: 27 + 1.08 = 28.08. The total cost is $28.08.
💡 How to solve: Markup, Sales Tax, Tips & Commission
Find the percent of the amount, then add it on. For a 30% markup on a $40 cost: 0.30 × 40 = 12, so the selling price is 40 + 12 = $52.00. Sales tax and tips are added the same way; a commission is just the percent of the sales. To find a percent markup, divide the markup by the original cost.
Try a similar one
A store pays $19.00 for a jacket and marks it up 50%. What is the selling price?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The error is how far the estimate is from the actual amount: 20 − 19 = 1. Compare it to the actual amount, 20. Write the part over the whole: 120. Multiply the top and the bottom by 5: 120 = 5100 = 5%. The percent error is 5%.
✓ Correct!
Not quite. The answer is
💡 The error is how far the estimate is from the actual amount: 20 − 19 = 1. Compare it to the actual amount, 20. Write the part over the whole: 120. Multiply the top and the bottom by 5: 120 = 5100 = 5%. The percent error is 5%.
💡 How to solve: Percent Increase, Decrease & Error
Percent of change = (amount of change) ÷ (original amount) × 100%. Subtract to find the change, divide by the ORIGINAL amount, then multiply by 100. Percent error works the same way: |estimate − actual| ÷ actual × 100%. To find a new amount after a 15% increase, multiply by 1.15 (or add 15% of the original).
Try a similar one
The number of songs on a playlist increased from 20 to 38. What is the percent increase?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Find the discount. 50% is half, so divide by 2: 100 ÷ 2 = 50. Subtract the discount from the price: 100 − 50 = 50. The sale price is $50.00.
✓ Correct!
Not quite. The answer is
💡 Find the discount. 50% is half, so divide by 2: 100 ÷ 2 = 50. Subtract the discount from the price: 100 − 50 = 50. The sale price is $50.00.
💡 How to solve: Percent Applications (Mixed Review)
For a discount, find the discount (price × percent ÷ 100) and subtract it from the price. For simple interest, use I = P × r × t, with the rate written as a decimal and time in years. Write money answers with a dollar sign and two decimal places.
Try a similar one
A $72.00 item is on sale for 25% off. What is the sale price?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Use I = P × r × t. Write the rate as a decimal: 10% = 0.1. The time is 1 year, so I = 800 × 0.1 × 1 = 80. The simple interest is $80.00.
✓ Correct!
Not quite. The answer is
💡 Use I = P × r × t. Write the rate as a decimal: 10% = 0.1. The time is 1 year, so I = 800 × 0.1 × 1 = 80. The simple interest is $80.00.
💡 How to solve: Simple Interest
Simple interest is I = P × r × t: the principal (the amount borrowed or saved), times the yearly rate as a decimal, times the time in years. $500 at 4% for 3 years: I = 500 × 0.04 × 3 = $60. Time in months must be changed to years first: 18 months = 1.5 years.
Try a similar one
Find the simple interest on $800 at 4% per year for 1 year.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Write the part over the whole: 35140 = 14. Multiply the top and the bottom by 25: 14 = 25100 = 25%.
✓ Correct!
Not quite. The answer is
💡 Write the part over the whole: 35140 = 14. Multiply the top and the bottom by 25: 14 = 25100 = 25%.
💡 How to solve: Percent Problems (Mixed Review)
To find a percent of a number, multiply: part = percent ÷ 100 × whole. To find what percent one number is of another, divide the part by the whole and multiply by 100, then write the % sign.
Try a similar one
What is 20% of 360?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Find the discount. 10% is 110, so divide by 10: 50 ÷ 10 = 5. Subtract the discount from the price: 50 − 5 = 45. The sale price is $45.00.
✓ Correct!
Not quite. The answer is
💡 Find the discount. 10% is 110, so divide by 10: 50 ÷ 10 = 5. Subtract the discount from the price: 50 − 5 = 45. The sale price is $45.00.
💡 How to solve: Discount and Sale Price
Find the discount, then subtract it from the price: 25% of $80 is $20, so the sale price is $80 - $20 = $60. Shortcut: 25% off means you pay 75%, so 0.75 × $80 = $60. For two discounts, take the second percent off the new sale price, not the original price.
Try a similar one
A printer costs $90. It is on sale for 50% off. What is the sale price?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 10 has 1 zero, so divide by moving the decimal point 1 place to the left. 18.8 ÷ 10 = 1.88.
✓ Correct!
Not quite. The answer is
💡 10 has 1 zero, so divide by moving the decimal point 1 place to the left. 18.8 ÷ 10 = 1.88.
💡 How to solve: Multiplying & Dividing Decimals by 10, 100, and 1,000 (Mixed Review)
Count the zeros in 10, 100, or 1,000. When multiplying, move the decimal point that many places to the right; when dividing, move it that many places to the left, adding zeros if needed.
Try a similar one
87.1 × 10 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Log in to save your progress.
Grade 7 Quiz: Decimals & Percents — Easy Version 1
Answer every question. The lesson name before each question tells you which skill it checks — open that lesson if you need a reminder.