Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 452 · 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. 1.725 increased by 12% =
2. 2.220 increased by 30% =
3. 3.675 increased by 8% =
4. 4.95 decreased by 20% =
5. 5.45 decreased by 60% =
6. 6.250 decreased by 40% =
7. 7.780 decreased by 35% =
8. 8.220 decreased by 15% =
9. 9.725 decreased by 12% =
10. 10.520 increased by 20% =
11. 11.75 decreased by 8% =
12. 12.350 increased by 12% =
13. 13.340 increased by 35% =
14. 14.440 increased by 75% =
15. 15.60 decreased by 10% =
16. 16.525 increased by 12% =
17. 17.380 decreased by 5% =
18. 18.150 decreased by 12% =
19. 19.630 increased by 30% =
20. 20.260 decreased by 15% =
21. 21.645 increased by 40% =
22. 22.272 decreased by 75% =
23. 23.80 increased by 5% =
24. 24.550 decreased by 8% =
25. 25.550 decreased by 40% =
26. 26.540 decreased by 15% =
27. 27.120 increased by 5% =
28. 28.220 decreased by 75% =
29. 29.50 increased by 12% =
30. 30.140 decreased by 35% =
31. 31.100 increased by 5% =
32. 32.328 decreased by 75% =
33. 33.720 decreased by 15% =
34. 34.330 decreased by 20% =
35. 35.310 increased by 20% =
36. 36.220 decreased by 15% =
37. 37.725 decreased by 8% =
38. 38.554 decreased by 50% =
39. 39.580 decreased by 35% =
40. 40.535 decreased by 40% =

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