Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 372 · 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. 1.600 decreased by 5% =
2. 2.270 decreased by 50% =
3. 3.680 increased by 15% =
4. 4.75 decreased by 12% =
5. 5.120 decreased by 20% =
6. 6.105 increased by 40% =
7. 7.325 increased by 8% =
8. 8.316 decreased by 50% =
9. 9.560 increased by 30% =
10. 10.780 decreased by 5% =
11. 11.495 increased by 40% =
12. 12.400 increased by 8% =
13. 13.450 increased by 8% =
14. 14.395 increased by 40% =
15. 15.240 decreased by 35% =
16. 16.560 increased by 20% =
17. 17.750 decreased by 8% =
18. 18.715 decreased by 60% =
19. 19.420 decreased by 5% =
20. 20.120 decreased by 5% =
21. 21.252 decreased by 50% =
22. 22.320 decreased by 5% =
23. 23.730 decreased by 20% =
24. 24.170 decreased by 30% =
25. 25.130 decreased by 20% =
26. 26.780 increased by 30% =
27. 27.556 decreased by 75% =
28. 28.716 increased by 25% =
29. 29.765 increased by 20% =
30. 30.236 decreased by 25% =
31. 31.690 increased by 30% =
32. 32.340 decreased by 20% =
33. 33.500 decreased by 15% =
34. 34.355 decreased by 20% =
35. 35.700 increased by 12% =
36. 36.624 decreased by 75% =
37. 37.500 increased by 35% =
38. 38.450 decreased by 12% =
39. 39.85 increased by 40% =
40. 40.360 increased by 5% =

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