Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 635 · 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. 1.602 increased by 50% =
2. 2.100 decreased by 12% =
3. 3.40 decreased by 35% =
4. 4.608 decreased by 25% =
5. 5.250 increased by 10% =
6. 6.450 increased by 12% =
7. 7.240 increased by 35% =
8. 8.548 increased by 50% =
9. 9.120 increased by 15% =
10. 10.300 decreased by 20% =
11. 11.790 increased by 20% =
12. 12.510 increased by 30% =
13. 13.720 decreased by 35% =
14. 14.520 increased by 10% =
15. 15.500 increased by 10% =
16. 16.260 increased by 75% =
17. 17.460 decreased by 10% =
18. 18.764 decreased by 50% =
19. 19.596 decreased by 75% =
20. 20.540 increased by 5% =
21. 21.270 increased by 10% =
22. 22.525 increased by 8% =
23. 23.560 increased by 15% =
24. 24.730 decreased by 10% =
25. 25.280 increased by 60% =
26. 26.215 increased by 60% =
27. 27.735 increased by 20% =
28. 28.256 decreased by 50% =
29. 29.80 decreased by 20% =
30. 30.450 increased by 8% =
31. 31.520 increased by 15% =
32. 32.75 increased by 8% =
33. 33.212 decreased by 25% =
34. 34.500 increased by 5% =
35. 35.220 increased by 35% =
36. 36.300 increased by 12% =
37. 37.610 decreased by 10% =
38. 38.246 decreased by 50% =
39. 39.330 increased by 10% =
40. 40.270 increased by 30% =

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