Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 90 · 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 increased by 8% =
2. 2.495 decreased by 40% =
3. 3.120 decreased by 5% =
4. 4.300 decreased by 35% =
5. 5.195 increased by 20% =
6. 6.688 decreased by 25% =
7. 7.622 decreased by 50% =
8. 8.750 increased by 60% =
9. 9.302 increased by 50% =
10. 10.648 increased by 75% =
11. 11.540 decreased by 35% =
12. 12.550 increased by 12% =
13. 13.420 increased by 40% =
14. 14.300 decreased by 8% =
15. 15.142 increased by 50% =
16. 16.414 decreased by 50% =
17. 17.660 increased by 75% =
18. 18.410 decreased by 30% =
19. 19.625 increased by 12% =
20. 20.460 increased by 5% =
21. 21.50 increased by 10% =
22. 22.780 decreased by 5% =
23. 23.420 decreased by 30% =
24. 24.160 increased by 15% =
25. 25.800 increased by 8% =
26. 26.600 increased by 8% =
27. 27.642 increased by 50% =
28. 28.735 increased by 40% =
29. 29.740 decreased by 60% =
30. 30.700 increased by 8% =
31. 31.456 decreased by 25% =
32. 32.250 increased by 12% =
33. 33.135 increased by 60% =
34. 34.580 decreased by 30% =
35. 35.158 decreased by 50% =
36. 36.200 decreased by 35% =
37. 37.632 decreased by 75% =
38. 38.375 decreased by 8% =
39. 39.276 increased by 25% =
40. 40.450 decreased by 12% =

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