Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 336 · 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. 1.330 increased by 30% =
2. 2.560 increased by 5% =
3. 3.470 increased by 10% =
4. 4.520 increased by 10% =
5. 5.790 decreased by 10% =
6. 6.710 increased by 50% =
7. 7.440 decreased by 60% =
8. 8.575 increased by 8% =
9. 9.438 decreased by 50% =
10. 10.160 increased by 35% =
11. 11.200 increased by 60% =
12. 12.575 decreased by 8% =
13. 13.250 increased by 8% =
14. 14.390 decreased by 50% =
15. 15.200 increased by 5% =
16. 16.120 decreased by 15% =
17. 17.575 increased by 12% =
18. 18.664 decreased by 25% =
19. 19.642 increased by 50% =
20. 20.250 decreased by 12% =
21. 21.500 increased by 40% =
22. 22.146 increased by 50% =
23. 23.115 decreased by 20% =
24. 24.350 decreased by 12% =
25. 25.765 decreased by 40% =
26. 26.720 increased by 5% =
27. 27.430 increased by 30% =
28. 28.60 increased by 75% =
29. 29.680 increased by 5% =
30. 30.720 decreased by 25% =
31. 31.200 decreased by 30% =
32. 32.120 decreased by 10% =
33. 33.115 decreased by 40% =
34. 34.465 increased by 40% =
35. 35.660 decreased by 15% =
36. 36.80 decreased by 5% =
37. 37.700 decreased by 8% =
38. 38.60 decreased by 40% =
39. 39.752 decreased by 75% =
40. 40.125 decreased by 12% =

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