Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 26 · 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. 1.550 decreased by 60% =
2. 2.120 increased by 25% =
3. 3.180 increased by 50% =
4. 4.500 increased by 12% =
5. 5.250 decreased by 12% =
6. 6.175 decreased by 8% =
7. 7.60 decreased by 35% =
8. 8.148 decreased by 75% =
9. 9.240 increased by 25% =
10. 10.308 decreased by 75% =
11. 11.674 increased by 50% =
12. 12.350 decreased by 30% =
13. 13.75 decreased by 60% =
14. 14.665 decreased by 60% =
15. 15.615 increased by 60% =
16. 16.235 increased by 40% =
17. 17.150 decreased by 12% =
18. 18.710 decreased by 10% =
19. 19.630 increased by 20% =
20. 20.410 increased by 30% =
21. 21.150 increased by 20% =
22. 22.450 decreased by 8% =
23. 23.760 increased by 15% =
24. 24.560 increased by 40% =
25. 25.520 decreased by 5% =
26. 26.535 increased by 60% =
27. 27.368 decreased by 25% =
28. 28.320 increased by 10% =
29. 29.142 decreased by 50% =
30. 30.70 decreased by 30% =
31. 31.344 increased by 25% =
32. 32.760 increased by 60% =
33. 33.574 increased by 50% =
34. 34.360 decreased by 35% =
35. 35.510 increased by 10% =
36. 36.770 increased by 20% =
37. 37.780 decreased by 35% =
38. 38.80 decreased by 15% =
39. 39.80 increased by 60% =
40. 40.90 increased by 20% =

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