Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 252 · 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. 1.140 increased by 15% =
2. 2.294 decreased by 50% =
3. 3.210 decreased by 40% =
4. 4.290 increased by 40% =
5. 5.72 decreased by 25% =
6. 6.60 increased by 35% =
7. 7.650 decreased by 60% =
8. 8.725 decreased by 60% =
9. 9.88 decreased by 25% =
10. 10.400 decreased by 5% =
11. 11.116 decreased by 50% =
12. 12.650 increased by 8% =
13. 13.800 decreased by 30% =
14. 14.776 decreased by 50% =
15. 15.220 increased by 5% =
16. 16.735 decreased by 20% =
17. 17.215 increased by 40% =
18. 18.320 increased by 5% =
19. 19.700 increased by 5% =
20. 20.380 increased by 15% =
21. 21.740 increased by 60% =
22. 22.375 decreased by 12% =
23. 23.120 increased by 15% =
24. 24.380 decreased by 30% =
25. 25.500 decreased by 5% =
26. 26.540 increased by 30% =
27. 27.650 increased by 20% =
28. 28.495 increased by 40% =
29. 29.425 increased by 40% =
30. 30.80 decreased by 15% =
31. 31.730 decreased by 10% =
32. 32.410 increased by 40% =
33. 33.740 increased by 15% =
34. 34.428 increased by 50% =
35. 35.240 increased by 25% =
36. 36.400 decreased by 15% =
37. 37.440 decreased by 35% =
38. 38.244 decreased by 75% =
39. 39.775 decreased by 20% =
40. 40.165 decreased by 40% =

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