Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 824 · 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. 1.525 decreased by 12% =
2. 2.800 decreased by 10% =
3. 3.140 increased by 30% =
4. 4.460 decreased by 50% =
5. 5.450 decreased by 8% =
6. 6.740 increased by 15% =
7. 7.776 decreased by 25% =
8. 8.110 decreased by 10% =
9. 9.68 increased by 25% =
10. 10.260 decreased by 60% =
11. 11.272 decreased by 25% =
12. 12.176 decreased by 25% =
13. 13.348 decreased by 75% =
14. 14.750 decreased by 8% =
15. 15.558 increased by 50% =
16. 16.550 decreased by 12% =
17. 17.75 decreased by 20% =
18. 18.100 increased by 8% =
19. 19.345 increased by 20% =
20. 20.725 decreased by 8% =
21. 21.700 increased by 8% =
22. 22.130 decreased by 20% =
23. 23.795 decreased by 20% =
24. 24.624 decreased by 25% =
25. 25.220 increased by 35% =
26. 26.230 decreased by 40% =
27. 27.180 decreased by 40% =
28. 28.200 increased by 12% =
29. 29.340 increased by 35% =
30. 30.764 increased by 25% =
31. 31.495 increased by 20% =
32. 32.100 increased by 5% =
33. 33.792 increased by 75% =
34. 34.172 decreased by 25% =
35. 35.680 decreased by 5% =
36. 36.650 decreased by 12% =
37. 37.780 decreased by 5% =
38. 38.520 increased by 15% =
39. 39.740 increased by 40% =
40. 40.190 decreased by 30% =

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