Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 235 · 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. 1.420 decreased by 15% =
2. 2.768 increased by 50% =
3. 3.230 decreased by 60% =
4. 4.40 decreased by 5% =
5. 5.540 increased by 15% =
6. 6.800 increased by 12% =
7. 7.580 decreased by 40% =
8. 8.530 increased by 30% =
9. 9.320 increased by 30% =
10. 10.540 decreased by 15% =
11. 11.175 increased by 60% =
12. 12.210 decreased by 20% =
13. 13.600 decreased by 12% =
14. 14.670 increased by 40% =
15. 15.190 decreased by 20% =
16. 16.350 decreased by 12% =
17. 17.310 decreased by 10% =
18. 18.790 increased by 30% =
19. 19.440 decreased by 10% =
20. 20.442 decreased by 50% =
21. 21.540 increased by 50% =
22. 22.760 increased by 10% =
23. 23.400 increased by 12% =
24. 24.640 increased by 10% =
25. 25.160 decreased by 75% =
26. 26.675 decreased by 8% =
27. 27.265 decreased by 20% =
28. 28.725 decreased by 20% =
29. 29.250 decreased by 12% =
30. 30.716 increased by 75% =
31. 31.460 increased by 15% =
32. 32.240 increased by 35% =
33. 33.160 decreased by 30% =
34. 34.452 decreased by 25% =
35. 35.420 decreased by 20% =
36. 36.360 increased by 15% =
37. 37.444 decreased by 25% =
38. 38.640 increased by 15% =
39. 39.295 decreased by 20% =
40. 40.86 increased by 50% =

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