Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 831 · 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. 1.720 decreased by 35% =
2. 2.488 increased by 50% =
3. 3.170 increased by 60% =
4. 4.475 increased by 20% =
5. 5.780 increased by 30% =
6. 6.790 decreased by 20% =
7. 7.500 decreased by 10% =
8. 8.228 decreased by 75% =
9. 9.716 increased by 75% =
10. 10.504 decreased by 75% =
11. 11.720 increased by 20% =
12. 12.220 increased by 5% =
13. 13.170 increased by 10% =
14. 14.525 increased by 8% =
15. 15.180 decreased by 10% =
16. 16.668 increased by 75% =
17. 17.640 increased by 5% =
18. 18.285 decreased by 20% =
19. 19.400 increased by 12% =
20. 20.230 increased by 10% =
21. 21.276 increased by 25% =
22. 22.170 increased by 10% =
23. 23.465 increased by 60% =
24. 24.690 decreased by 10% =
25. 25.785 decreased by 60% =
26. 26.200 increased by 15% =
27. 27.300 decreased by 15% =
28. 28.232 decreased by 50% =
29. 29.620 decreased by 5% =
30. 30.560 decreased by 30% =
31. 31.104 increased by 50% =
32. 32.40 increased by 30% =
33. 33.560 increased by 35% =
34. 34.300 decreased by 12% =
35. 35.80 decreased by 40% =
36. 36.340 decreased by 15% =
37. 37.175 decreased by 60% =
38. 38.416 decreased by 50% =
39. 39.50 increased by 20% =
40. 40.710 decreased by 20% =

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