Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 509 · 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. 1.740 decreased by 35% =
2. 2.210 decreased by 10% =
3. 3.670 decreased by 30% =
4. 4.586 decreased by 50% =
5. 5.575 increased by 12% =
6. 6.274 increased by 50% =
7. 7.85 decreased by 20% =
8. 8.360 decreased by 20% =
9. 9.420 increased by 5% =
10. 10.92 decreased by 50% =
11. 11.300 decreased by 8% =
12. 12.155 increased by 60% =
13. 13.120 increased by 5% =
14. 14.348 increased by 75% =
15. 15.235 decreased by 20% =
16. 16.600 decreased by 35% =
17. 17.240 decreased by 15% =
18. 18.155 decreased by 20% =
19. 19.284 increased by 75% =
20. 20.376 decreased by 50% =
21. 21.120 increased by 60% =
22. 22.560 increased by 10% =
23. 23.600 increased by 5% =
24. 24.780 decreased by 35% =
25. 25.130 increased by 50% =
26. 26.540 increased by 15% =
27. 27.370 decreased by 30% =
28. 28.484 increased by 25% =
29. 29.100 decreased by 5% =
30. 30.355 increased by 20% =
31. 31.224 increased by 75% =
32. 32.280 increased by 15% =
33. 33.780 increased by 30% =
34. 34.120 increased by 35% =
35. 35.80 decreased by 40% =
36. 36.100 decreased by 12% =
37. 37.540 decreased by 10% =
38. 38.340 increased by 30% =
39. 39.116 decreased by 50% =
40. 40.220 decreased by 40% =

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