Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 609 · 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. 1.660 increased by 35% =
2. 2.310 decreased by 30% =
3. 3.250 increased by 8% =
4. 4.420 increased by 15% =
5. 5.460 increased by 35% =
6. 6.800 increased by 60% =
7. 7.64 increased by 75% =
8. 8.288 decreased by 25% =
9. 9.260 increased by 35% =
10. 10.250 decreased by 12% =
11. 11.360 decreased by 5% =
12. 12.670 increased by 10% =
13. 13.280 decreased by 10% =
14. 14.550 decreased by 12% =
15. 15.540 decreased by 30% =
16. 16.200 increased by 15% =
17. 17.500 increased by 12% =
18. 18.185 increased by 40% =
19. 19.70 increased by 40% =
20. 20.470 increased by 10% =
21. 21.350 increased by 8% =
22. 22.210 increased by 10% =
23. 23.500 increased by 15% =
24. 24.464 increased by 75% =
25. 25.480 decreased by 25% =
26. 26.475 increased by 8% =
27. 27.775 increased by 12% =
28. 28.60 increased by 5% =
29. 29.280 increased by 15% =
30. 30.180 decreased by 35% =
31. 31.230 increased by 60% =
32. 32.220 decreased by 25% =
33. 33.40 decreased by 35% =
34. 34.68 increased by 75% =
35. 35.400 increased by 30% =
36. 36.270 decreased by 10% =
37. 37.125 decreased by 8% =
38. 38.72 decreased by 25% =
39. 39.124 decreased by 50% =
40. 40.660 decreased by 10% =

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