Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 598 · 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 20% =
2. 2.740 decreased by 75% =
3. 3.120 decreased by 35% =
4. 4.600 increased by 12% =
5. 5.780 decreased by 30% =
6. 6.400 increased by 12% =
7. 7.620 decreased by 15% =
8. 8.720 increased by 30% =
9. 9.60 increased by 10% =
10. 10.300 increased by 8% =
11. 11.400 increased by 35% =
12. 12.450 increased by 8% =
13. 13.60 increased by 5% =
14. 14.490 increased by 10% =
15. 15.738 decreased by 50% =
16. 16.460 decreased by 30% =
17. 17.168 decreased by 25% =
18. 18.480 decreased by 15% =
19. 19.690 increased by 10% =
20. 20.480 decreased by 30% =
21. 21.225 decreased by 8% =
22. 22.740 increased by 35% =
23. 23.300 increased by 15% =
24. 24.40 decreased by 40% =
25. 25.440 increased by 35% =
26. 26.640 increased by 20% =
27. 27.225 increased by 12% =
28. 28.360 increased by 30% =
29. 29.215 decreased by 20% =
30. 30.600 decreased by 8% =
31. 31.755 decreased by 60% =
32. 32.800 increased by 35% =
33. 33.330 decreased by 40% =
34. 34.130 increased by 10% =
35. 35.575 decreased by 8% =
36. 36.88 decreased by 50% =
37. 37.280 decreased by 15% =
38. 38.600 decreased by 35% =
39. 39.360 decreased by 5% =
40. 40.260 decreased by 30% =

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