Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 653 · 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. 1.185 increased by 20% =
2. 2.85 increased by 60% =
3. 3.120 increased by 40% =
4. 4.740 increased by 10% =
5. 5.130 increased by 10% =
6. 6.220 increased by 20% =
7. 7.305 decreased by 40% =
8. 8.430 decreased by 20% =
9. 9.670 decreased by 30% =
10. 10.482 decreased by 50% =
11. 11.40 decreased by 10% =
12. 12.460 decreased by 10% =
13. 13.680 decreased by 15% =
14. 14.780 decreased by 5% =
15. 15.190 increased by 60% =
16. 16.80 increased by 35% =
17. 17.215 increased by 40% =
18. 18.760 decreased by 35% =
19. 19.630 increased by 10% =
20. 20.330 decreased by 10% =
21. 21.625 decreased by 12% =
22. 22.390 increased by 40% =
23. 23.370 decreased by 40% =
24. 24.575 increased by 12% =
25. 25.688 decreased by 50% =
26. 26.380 decreased by 5% =
27. 27.240 decreased by 15% =
28. 28.100 increased by 15% =
29. 29.225 decreased by 12% =
30. 30.315 increased by 20% =
31. 31.255 decreased by 60% =
32. 32.620 increased by 20% =
33. 33.150 increased by 10% =
34. 34.800 decreased by 20% =
35. 35.265 increased by 60% =
36. 36.75 increased by 20% =
37. 37.522 decreased by 50% =
38. 38.500 decreased by 5% =
39. 39.60 increased by 15% =
40. 40.135 increased by 20% =

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