Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 370 · 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. 1.590 increased by 10% =
2. 2.330 increased by 10% =
3. 3.350 increased by 20% =
4. 4.800 increased by 5% =
5. 5.120 decreased by 5% =
6. 6.440 increased by 5% =
7. 7.620 decreased by 60% =
8. 8.230 decreased by 10% =
9. 9.224 increased by 25% =
10. 10.580 decreased by 40% =
11. 11.245 decreased by 60% =
12. 12.110 increased by 10% =
13. 13.800 increased by 15% =
14. 14.580 increased by 5% =
15. 15.584 increased by 25% =
16. 16.90 decreased by 60% =
17. 17.675 decreased by 12% =
18. 18.592 increased by 75% =
19. 19.290 decreased by 40% =
20. 20.700 decreased by 75% =
21. 21.68 decreased by 25% =
22. 22.600 increased by 15% =
23. 23.76 decreased by 25% =
24. 24.640 decreased by 20% =
25. 25.444 increased by 25% =
26. 26.500 decreased by 15% =
27. 27.740 decreased by 50% =
28. 28.440 decreased by 30% =
29. 29.520 increased by 15% =
30. 30.60 increased by 10% =
31. 31.60 increased by 40% =
32. 32.750 decreased by 50% =
33. 33.420 increased by 5% =
34. 34.740 increased by 15% =
35. 35.142 decreased by 50% =
36. 36.625 decreased by 20% =
37. 37.540 decreased by 5% =
38. 38.60 increased by 20% =
39. 39.485 increased by 40% =
40. 40.314 decreased by 50% =

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