Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 496 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.260 increased by 30% =
2. 2.200 decreased by 40% =
3. 3.105 increased by 20% =
4. 4.80 increased by 15% =
5. 5.100 increased by 8% =
6. 6.232 decreased by 75% =
7. 7.390 decreased by 20% =
8. 8.156 increased by 25% =
9. 9.500 decreased by 8% =
10. 10.115 increased by 40% =
11. 11.680 decreased by 5% =
12. 12.665 decreased by 40% =
13. 13.555 increased by 60% =
14. 14.40 increased by 5% =
15. 15.652 increased by 50% =
16. 16.100 decreased by 20% =
17. 17.400 decreased by 40% =
18. 18.390 increased by 20% =
19. 19.564 increased by 25% =
20. 20.340 decreased by 15% =
21. 21.250 increased by 60% =
22. 22.795 decreased by 60% =
23. 23.550 increased by 30% =
24. 24.645 decreased by 20% =
25. 25.660 increased by 30% =
26. 26.800 increased by 30% =
27. 27.425 increased by 8% =
28. 28.605 decreased by 40% =
29. 29.700 increased by 35% =
30. 30.700 decreased by 35% =
31. 31.280 decreased by 15% =
32. 32.440 decreased by 75% =
33. 33.580 decreased by 35% =
34. 34.200 increased by 5% =
35. 35.250 increased by 30% =
36. 36.315 decreased by 40% =
37. 37.180 decreased by 5% =
38. 38.800 increased by 10% =
39. 39.400 decreased by 35% =
40. 40.640 decreased by 5% =

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