Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 200 · 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. 1.150 decreased by 8% =
2. 2.310 decreased by 40% =
3. 3.140 increased by 5% =
4. 4.225 increased by 12% =
5. 5.520 increased by 35% =
6. 6.475 increased by 8% =
7. 7.795 decreased by 20% =
8. 8.80 increased by 15% =
9. 9.320 increased by 15% =
10. 10.436 increased by 25% =
11. 11.560 increased by 35% =
12. 12.600 increased by 15% =
13. 13.580 increased by 60% =
14. 14.800 decreased by 30% =
15. 15.325 increased by 8% =
16. 16.96 decreased by 25% =
17. 17.40 decreased by 20% =
18. 18.506 increased by 50% =
19. 19.50 increased by 12% =
20. 20.115 increased by 20% =
21. 21.700 decreased by 35% =
22. 22.75 decreased by 60% =
23. 23.480 decreased by 15% =
24. 24.255 increased by 20% =
25. 25.620 increased by 30% =
26. 26.296 decreased by 75% =
27. 27.185 increased by 40% =
28. 28.720 decreased by 15% =
29. 29.600 increased by 8% =
30. 30.100 increased by 20% =
31. 31.440 increased by 10% =
32. 32.480 decreased by 35% =
33. 33.50 increased by 10% =
34. 34.430 increased by 40% =
35. 35.288 increased by 75% =
36. 36.700 increased by 60% =
37. 37.608 decreased by 75% =
38. 38.590 increased by 30% =
39. 39.405 increased by 40% =
40. 40.68 increased by 25% =

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