Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 143 · 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. 1.475 decreased by 12% =
2. 2.320 increased by 75% =
3. 3.380 increased by 25% =
4. 4.160 increased by 15% =
5. 5.300 decreased by 5% =
6. 6.390 increased by 10% =
7. 7.50 decreased by 40% =
8. 8.506 increased by 50% =
9. 9.504 increased by 75% =
10. 10.700 increased by 15% =
11. 11.270 increased by 10% =
12. 12.650 decreased by 8% =
13. 13.360 decreased by 5% =
14. 14.420 increased by 35% =
15. 15.398 decreased by 50% =
16. 16.540 increased by 5% =
17. 17.320 decreased by 5% =
18. 18.520 increased by 15% =
19. 19.100 decreased by 15% =
20. 20.370 decreased by 10% =
21. 21.295 decreased by 40% =
22. 22.160 decreased by 5% =
23. 23.105 increased by 20% =
24. 24.88 decreased by 50% =
25. 25.60 decreased by 35% =
26. 26.330 decreased by 10% =
27. 27.240 increased by 10% =
28. 28.160 decreased by 15% =
29. 29.510 increased by 20% =
30. 30.70 increased by 10% =
31. 31.392 decreased by 25% =
32. 32.775 increased by 8% =
33. 33.120 decreased by 30% =
34. 34.150 increased by 8% =
35. 35.685 increased by 20% =
36. 36.350 decreased by 20% =
37. 37.440 increased by 30% =
38. 38.330 decreased by 20% =
39. 39.100 decreased by 25% =
40. 40.634 decreased by 50% =

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