Math 8 · Unit 10: Percentages · Cambridge Lower Secondary Maths Stage 8

Questions

1. 1. Multiplier for an increase of 15%?

   • 0.15
   • 15
   • 1.15
   • 0.85
   Check

2. 2. Multiplier for a decrease of 15%?

   • 1.15
   • 0.15
   • −0.15
   • 0.85
   Check

3. 3. Multiplier to find 35% of an amount?

   • 0.65
   • 1.35
   • 0.35
   • 35
   Check

4. 4. Increase $80 using × 1.15.

   • $95
   • $92
   • $12
   • $68
   Check

5. 5. Multiplier for a 3% increase?

   • 0.97
   • 0.03
   • 1.3
   • 1.03
   Check

6. 6. Multiplier for a 40% decrease?

   • 1.6
   • 1.4
   • 0.4
   • 0.6
   Check

7. 7. What percentage change does × 1.2 give?

   • 20% increase
   • 20% decrease
   • 12% increase
   • 120% increase
   Check

8. 8. What percentage change does × 0.9 give?

   • 9% decrease
   • 10% decrease
   • 10% increase
   • 90% decrease
   Check

9. 9. Decrease 250 by 20% using a multiplier.

   • 200
   • 300
   • 230
   • 50
   Check

10. 10. $1000 grows by 10% each year for 2 years. Final amount?

    • $1100
    • $1210
    • $1200
    • $1020
    Check

11. 11. Multiplier for a 100% increase?

    • 2
    • 1.1
    • 100
    • 1
    Check

12. 12. Multiplier for a 7.5% increase?

    • 1.075
    • 1.75
    • 1.0075
    • 0.925
    Check

13. 13. A shirt costs $36 after a 25% discount. Original price?

    • $48
    • $45
    • $61
    • $27
    Check

14. 14. × 0.5 is the same as a … decrease.

    • 50%
    • 5%
    • 0.5%
    • 150%
    Check

15. 15. An increase of 10% then 20% is the same as a single multiplier of …

    • 1.12
    • 1.3
    • 1.02
    • 1.32
    Check