# Percentage increase and decrease

> Grade 7: increase by a percentage, decrease by a percentage, find a percentage of an amount, discounts and sales, one quantity as a percentage of another.

Source: https://olyclass.com/library/math-g7-percent-change-en/

- Subject: Math
- Level: Grade 7
- Practice: 16
- Play it free on one screen (projector, TV or whiteboard): https://olyclass.com/library?play=math-g7-percent-change-en
- Copy and edit it: https://olyclass.com/library?copy=math-g7-percent-change-en
- Games it plays well in: [Bowling](https://olyclass.com/classroom-games/bowling/), [Hoop Shot](https://olyclass.com/classroom-games/hoop-shot/), [Penalty Kick](https://olyclass.com/classroom-games/penalty-kick/), [Fishing Pond](https://olyclass.com/classroom-games/fishing-pond/)

## Questions

1. Increase 200 by 10%. What is the result? (20 / 202 / 210 / 220)
   Answer: 220
2. A plant is 40 cm tall and grows by 50%. How tall is it now? (50 cm / 60 cm / 80 cm / 90 cm)
   Answer: 60 cm
3. Increase 80 by 25%. What is the result? (100 / 105 / 120 / 85)
   Answer: 100
4. Decrease 300 by 10%. What is the result? (270 / 290 / 30 / 330)
   Answer: 270
5. A town has 2000 people. The number falls by 5%. How many people now? (1800 / 1900 / 1950 / 1990)
   Answer: 1900
6. What is 15% of 60? (12 / 15 / 6 / 9)
   Answer: 9
7. A book costs $20 and has 25% off. What is the sale price? ($15 / $18 / $25 / $5)
   Answer: $15
8. A coat costs $80. The sale takes off 30%. How much do you pay? ($110 / $24 / $50 / $56)
   Answer: $56
9. What is 12 as a percentage of 48? (12% / 25% / 4% / 50%)
   Answer: 25%
10. Mia scores 36 out of 45 in a test. What percentage is that? (75% / 80% / 85% / 90%)
   Answer: 80%
11. Increasing a number by 100% doubles it.
   Answer: True
12. If you increase a price by 10% and then decrease it by 10%, you get the original price.
   Answer: False
13. Decreasing an amount by 50% gives the same result as halving it.
   Answer: True
14. A $150 bike is reduced by 20%. What is the sale price in dollars?
   Answer: $120
15. A price rises from $50 to $60. What is the percentage increase?
   Answer: 20%
16. What is 5% of 400?
   Answer: 20