Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 312 · 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. 1.150 decreased by 12% =
2. 2.460 increased by 15% =
3. 3.680 decreased by 10% =
4. 4.360 increased by 15% =
5. 5.190 increased by 30% =
6. 6.136 increased by 50% =
7. 7.636 increased by 75% =
8. 8.490 increased by 60% =
9. 9.190 increased by 30% =
10. 10.650 increased by 12% =
11. 11.740 decreased by 15% =
12. 12.535 decreased by 20% =
13. 13.450 decreased by 8% =
14. 14.540 increased by 15% =
15. 15.500 increased by 75% =
16. 16.500 increased by 8% =
17. 17.200 increased by 60% =
18. 18.175 increased by 60% =
19. 19.730 increased by 10% =
20. 20.630 decreased by 30% =
21. 21.70 decreased by 20% =
22. 22.620 increased by 5% =
23. 23.370 increased by 10% =
24. 24.600 decreased by 35% =
25. 25.190 increased by 10% =
26. 26.100 increased by 35% =
27. 27.380 increased by 15% =
28. 28.100 decreased by 12% =
29. 29.412 increased by 75% =
30. 30.240 decreased by 25% =
31. 31.688 increased by 25% =
32. 32.212 decreased by 75% =
33. 33.510 increased by 60% =
34. 34.375 increased by 8% =
35. 35.690 increased by 20% =
36. 36.490 increased by 30% =
37. 37.572 decreased by 75% =
38. 38.260 increased by 35% =
39. 39.234 increased by 50% =
40. 40.110 decreased by 60% =

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