Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 164 · 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. 1.220 decreased by 20% =
2. 2.375 increased by 40% =
3. 3.50 decreased by 8% =
4. 4.710 decreased by 40% =
5. 5.440 increased by 75% =
6. 6.724 decreased by 50% =
7. 7.310 decreased by 10% =
8. 8.440 increased by 5% =
9. 9.280 increased by 5% =
10. 10.200 increased by 15% =
11. 11.800 decreased by 20% =
12. 12.400 increased by 5% =
13. 13.360 decreased by 30% =
14. 14.100 increased by 8% =
15. 15.780 decreased by 35% =
16. 16.550 decreased by 12% =
17. 17.430 increased by 40% =
18. 18.785 increased by 60% =
19. 19.720 increased by 15% =
20. 20.740 decreased by 30% =
21. 21.692 increased by 25% =
22. 22.40 decreased by 15% =
23. 23.45 decreased by 60% =
24. 24.460 increased by 10% =
25. 25.130 increased by 30% =
26. 26.380 decreased by 10% =
27. 27.680 increased by 5% =
28. 28.60 decreased by 5% =
29. 29.80 decreased by 10% =
30. 30.798 decreased by 50% =
31. 31.350 increased by 20% =
32. 32.525 decreased by 12% =
33. 33.680 decreased by 10% =
34. 34.164 increased by 25% =
35. 35.788 increased by 25% =
36. 36.60 decreased by 5% =
37. 37.400 increased by 15% =
38. 38.290 increased by 30% =
39. 39.200 decreased by 8% =
40. 40.310 decreased by 60% =

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