Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 40 · 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. 1.156 increased by 25% =
2. 2.310 decreased by 40% =
3. 3.100 increased by 12% =
4. 4.480 increased by 10% =
5. 5.240 decreased by 35% =
6. 6.272 decreased by 75% =
7. 7.260 increased by 20% =
8. 8.125 decreased by 8% =
9. 9.212 decreased by 75% =
10. 10.128 decreased by 75% =
11. 11.140 increased by 15% =
12. 12.770 increased by 40% =
13. 13.700 increased by 25% =
14. 14.65 increased by 40% =
15. 15.780 increased by 5% =
16. 16.476 increased by 75% =
17. 17.300 decreased by 8% =
18. 18.750 increased by 30% =
19. 19.540 decreased by 5% =
20. 20.65 decreased by 20% =
21. 21.240 increased by 15% =
22. 22.588 decreased by 75% =
23. 23.130 increased by 40% =
24. 24.730 increased by 40% =
25. 25.360 decreased by 5% =
26. 26.320 decreased by 40% =
27. 27.50 decreased by 30% =
28. 28.620 decreased by 40% =
29. 29.490 decreased by 20% =
30. 30.480 increased by 40% =
31. 31.700 decreased by 35% =
32. 32.700 decreased by 30% =
33. 33.296 decreased by 50% =
34. 34.350 increased by 12% =
35. 35.245 increased by 20% =
36. 36.172 increased by 75% =
37. 37.260 decreased by 35% =
38. 38.60 increased by 35% =
39. 39.745 increased by 40% =
40. 40.100 decreased by 15% =

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