Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 642 · 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. 1.760 decreased by 35% =
2. 2.765 decreased by 20% =
3. 3.788 increased by 25% =
4. 4.240 increased by 10% =
5. 5.508 decreased by 75% =
6. 6.580 increased by 15% =
7. 7.112 decreased by 25% =
8. 8.320 increased by 5% =
9. 9.60 increased by 15% =
10. 10.175 increased by 20% =
11. 11.560 increased by 35% =
12. 12.800 increased by 35% =
13. 13.550 increased by 12% =
14. 14.80 increased by 15% =
15. 15.50 decreased by 8% =
16. 16.128 decreased by 25% =
17. 17.500 increased by 12% =
18. 18.720 increased by 15% =
19. 19.740 decreased by 10% =
20. 20.432 increased by 75% =
21. 21.730 decreased by 10% =
22. 22.340 decreased by 15% =
23. 23.106 increased by 50% =
24. 24.200 decreased by 15% =
25. 25.530 decreased by 30% =
26. 26.260 increased by 35% =
27. 27.640 decreased by 15% =
28. 28.95 increased by 20% =
29. 29.100 increased by 35% =
30. 30.40 increased by 25% =
31. 31.800 decreased by 20% =
32. 32.440 decreased by 5% =
33. 33.600 increased by 15% =
34. 34.80 increased by 5% =
35. 35.70 increased by 30% =
36. 36.70 decreased by 40% =
37. 37.325 decreased by 8% =
38. 38.95 decreased by 40% =
39. 39.772 increased by 50% =
40. 40.210 increased by 30% =

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