Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 47 · 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. 1.540 decreased by 15% =
2. 2.588 increased by 25% =
3. 3.125 decreased by 12% =
4. 4.120 increased by 5% =
5. 5.770 decreased by 30% =
6. 6.264 increased by 25% =
7. 7.720 increased by 15% =
8. 8.305 increased by 60% =
9. 9.280 increased by 30% =
10. 10.430 increased by 20% =
11. 11.440 decreased by 15% =
12. 12.650 decreased by 12% =
13. 13.420 increased by 15% =
14. 14.192 increased by 50% =
15. 15.380 decreased by 35% =
16. 16.790 increased by 50% =
17. 17.350 decreased by 8% =
18. 18.780 increased by 40% =
19. 19.100 increased by 10% =
20. 20.620 increased by 35% =
21. 21.210 increased by 10% =
22. 22.520 increased by 15% =
23. 23.390 decreased by 30% =
24. 24.685 increased by 40% =
25. 25.775 increased by 12% =
26. 26.428 increased by 25% =
27. 27.80 increased by 5% =
28. 28.700 decreased by 60% =
29. 29.660 increased by 15% =
30. 30.340 decreased by 35% =
31. 31.660 decreased by 60% =
32. 32.460 decreased by 35% =
33. 33.420 decreased by 15% =
34. 34.395 decreased by 40% =
35. 35.75 increased by 12% =
36. 36.675 decreased by 12% =
37. 37.444 increased by 75% =
38. 38.720 increased by 30% =
39. 39.500 increased by 20% =
40. 40.480 increased by 5% =

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