Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 184 · 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. 1.540 decreased by 35% =
2. 2.140 increased by 15% =
3. 3.645 increased by 20% =
4. 4.620 increased by 35% =
5. 5.405 decreased by 40% =
6. 6.660 decreased by 30% =
7. 7.800 increased by 30% =
8. 8.740 decreased by 40% =
9. 9.534 decreased by 50% =
10. 10.680 decreased by 40% =
11. 11.600 increased by 12% =
12. 12.408 increased by 50% =
13. 13.660 decreased by 35% =
14. 14.800 decreased by 5% =
15. 15.560 increased by 40% =
16. 16.370 decreased by 10% =
17. 17.316 increased by 75% =
18. 18.324 decreased by 25% =
19. 19.335 increased by 20% =
20. 20.600 decreased by 15% =
21. 21.95 decreased by 20% =
22. 22.120 decreased by 20% =
23. 23.260 increased by 5% =
24. 24.800 decreased by 8% =
25. 25.620 decreased by 20% =
26. 26.40 increased by 5% =
27. 27.175 increased by 20% =
28. 28.790 decreased by 10% =
29. 29.520 increased by 40% =
30. 30.708 increased by 75% =
31. 31.312 increased by 75% =
32. 32.115 increased by 20% =
33. 33.560 increased by 75% =
34. 34.684 decreased by 75% =
35. 35.400 increased by 35% =
36. 36.325 decreased by 8% =
37. 37.120 increased by 5% =
38. 38.436 increased by 25% =
39. 39.740 decreased by 30% =
40. 40.530 decreased by 60% =

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