Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 11 · 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 60% =
2. 2.150 decreased by 12% =
3. 3.60 increased by 35% =
4. 4.480 increased by 15% =
5. 5.260 increased by 35% =
6. 6.340 increased by 15% =
7. 7.375 decreased by 8% =
8. 8.402 increased by 50% =
9. 9.300 increased by 10% =
10. 10.300 increased by 12% =
11. 11.336 increased by 25% =
12. 12.626 decreased by 50% =
13. 13.265 decreased by 20% =
14. 14.460 increased by 35% =
15. 15.660 increased by 15% =
16. 16.540 increased by 15% =
17. 17.270 decreased by 30% =
18. 18.360 decreased by 10% =
19. 19.340 decreased by 15% =
20. 20.440 increased by 25% =
21. 21.565 decreased by 60% =
22. 22.392 decreased by 50% =
23. 23.650 decreased by 10% =
24. 24.556 increased by 25% =
25. 25.780 decreased by 60% =
26. 26.640 decreased by 15% =
27. 27.560 increased by 15% =
28. 28.375 increased by 8% =
29. 29.690 increased by 40% =
30. 30.720 increased by 10% =
31. 31.280 decreased by 35% =
32. 32.610 decreased by 30% =
33. 33.75 increased by 12% =
34. 34.120 increased by 25% =
35. 35.380 decreased by 5% =
36. 36.600 increased by 50% =
37. 37.420 increased by 15% =
38. 38.40 decreased by 5% =
39. 39.40 increased by 35% =
40. 40.744 decreased by 75% =

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