Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 100 · 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. 1.248 decreased by 75% =
2. 2.60 increased by 75% =
3. 3.200 decreased by 40% =
4. 4.240 increased by 35% =
5. 5.230 decreased by 60% =
6. 6.324 increased by 25% =
7. 7.304 increased by 75% =
8. 8.475 increased by 60% =
9. 9.170 decreased by 40% =
10. 10.252 increased by 25% =
11. 11.310 increased by 50% =
12. 12.110 decreased by 30% =
13. 13.120 increased by 15% =
14. 14.320 decreased by 5% =
15. 15.592 increased by 75% =
16. 16.735 increased by 20% =
17. 17.720 decreased by 35% =
18. 18.600 decreased by 35% =
19. 19.520 decreased by 20% =
20. 20.170 decreased by 40% =
21. 21.300 increased by 8% =
22. 22.664 decreased by 75% =
23. 23.160 increased by 5% =
24. 24.800 increased by 50% =
25. 25.555 decreased by 60% =
26. 26.445 increased by 40% =
27. 27.440 increased by 10% =
28. 28.95 decreased by 20% =
29. 29.560 decreased by 35% =
30. 30.260 increased by 30% =
31. 31.448 decreased by 75% =
32. 32.756 decreased by 75% =
33. 33.470 increased by 20% =
34. 34.440 decreased by 20% =
35. 35.378 decreased by 50% =
36. 36.175 decreased by 12% =
37. 37.310 increased by 10% =
38. 38.365 decreased by 20% =
39. 39.576 increased by 50% =
40. 40.740 increased by 20% =

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