Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 550 · 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. 1.340 decreased by 10% =
2. 2.560 increased by 5% =
3. 3.460 decreased by 60% =
4. 4.660 decreased by 10% =
5. 5.76 decreased by 50% =
6. 6.550 decreased by 20% =
7. 7.650 decreased by 40% =
8. 8.770 increased by 40% =
9. 9.150 increased by 8% =
10. 10.740 increased by 5% =
11. 11.505 increased by 20% =
12. 12.800 increased by 5% =
13. 13.100 decreased by 35% =
14. 14.120 increased by 5% =
15. 15.600 increased by 8% =
16. 16.704 increased by 25% =
17. 17.380 increased by 35% =
18. 18.524 decreased by 25% =
19. 19.680 decreased by 20% =
20. 20.490 increased by 20% =
21. 21.665 increased by 40% =
22. 22.200 increased by 15% =
23. 23.740 increased by 15% =
24. 24.125 decreased by 60% =
25. 25.250 decreased by 8% =
26. 26.240 increased by 15% =
27. 27.400 increased by 12% =
28. 28.440 increased by 5% =
29. 29.424 increased by 75% =
30. 30.375 increased by 12% =
31. 31.432 decreased by 50% =
32. 32.132 increased by 25% =
33. 33.650 increased by 12% =
34. 34.628 increased by 25% =
35. 35.70 increased by 20% =
36. 36.320 increased by 20% =
37. 37.800 increased by 12% =
38. 38.425 increased by 60% =
39. 39.625 decreased by 8% =
40. 40.204 decreased by 50% =

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