Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 274 · 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. 1.660 increased by 25% =
2. 2.630 decreased by 30% =
3. 3.60 decreased by 15% =
4. 4.438 decreased by 50% =
5. 5.80 decreased by 5% =
6. 6.260 decreased by 10% =
7. 7.300 decreased by 35% =
8. 8.225 decreased by 40% =
9. 9.600 decreased by 20% =
10. 10.770 increased by 20% =
11. 11.160 increased by 50% =
12. 12.82 decreased by 50% =
13. 13.510 increased by 30% =
14. 14.440 increased by 10% =
15. 15.60 increased by 35% =
16. 16.440 increased by 10% =
17. 17.125 increased by 8% =
18. 18.685 increased by 40% =
19. 19.240 decreased by 10% =
20. 20.592 increased by 25% =
21. 21.768 increased by 25% =
22. 22.116 increased by 25% =
23. 23.800 decreased by 5% =
24. 24.760 decreased by 15% =
25. 25.140 decreased by 25% =
26. 26.660 increased by 5% =
27. 27.396 increased by 25% =
28. 28.440 increased by 60% =
29. 29.320 increased by 35% =
30. 30.620 increased by 10% =
31. 31.86 decreased by 50% =
32. 32.520 decreased by 35% =
33. 33.460 increased by 15% =
34. 34.200 increased by 8% =
35. 35.375 decreased by 12% =
36. 36.270 increased by 30% =
37. 37.400 increased by 8% =
38. 38.612 increased by 50% =
39. 39.60 decreased by 35% =
40. 40.600 decreased by 15% =

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