Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 86 · 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. 1.620 decreased by 15% =
2. 2.150 decreased by 10% =
3. 3.390 decreased by 10% =
4. 4.796 decreased by 25% =
5. 5.380 decreased by 30% =
6. 6.130 increased by 30% =
7. 7.100 increased by 30% =
8. 8.76 increased by 75% =
9. 9.736 decreased by 50% =
10. 10.420 decreased by 35% =
11. 11.240 decreased by 10% =
12. 12.200 increased by 30% =
13. 13.540 decreased by 75% =
14. 14.260 decreased by 60% =
15. 15.100 decreased by 5% =
16. 16.600 increased by 8% =
17. 17.75 decreased by 8% =
18. 18.450 decreased by 60% =
19. 19.400 increased by 15% =
20. 20.240 decreased by 5% =
21. 21.630 increased by 60% =
22. 22.700 decreased by 35% =
23. 23.740 increased by 25% =
24. 24.795 increased by 40% =
25. 25.610 decreased by 40% =
26. 26.620 increased by 30% =
27. 27.60 decreased by 5% =
28. 28.740 increased by 15% =
29. 29.520 increased by 20% =
30. 30.226 decreased by 50% =
31. 31.770 decreased by 20% =
32. 32.160 increased by 10% =
33. 33.210 decreased by 20% =
34. 34.400 increased by 10% =
35. 35.252 decreased by 50% =
36. 36.488 decreased by 25% =
37. 37.100 decreased by 10% =
38. 38.215 increased by 20% =
39. 39.680 decreased by 15% =
40. 40.480 increased by 15% =

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