Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 784 · 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. 1.120 increased by 30% =
2. 2.452 increased by 25% =
3. 3.140 decreased by 75% =
4. 4.650 decreased by 12% =
5. 5.200 increased by 10% =
6. 6.140 increased by 10% =
7. 7.440 increased by 5% =
8. 8.750 decreased by 12% =
9. 9.690 increased by 10% =
10. 10.784 increased by 25% =
11. 11.156 increased by 75% =
12. 12.104 increased by 25% =
13. 13.756 decreased by 75% =
14. 14.750 increased by 8% =
15. 15.500 increased by 25% =
16. 16.600 decreased by 35% =
17. 17.380 decreased by 30% =
18. 18.120 decreased by 15% =
19. 19.475 increased by 20% =
20. 20.250 increased by 12% =
21. 21.748 decreased by 75% =
22. 22.660 increased by 15% =
23. 23.100 decreased by 8% =
24. 24.640 increased by 5% =
25. 25.700 increased by 15% =
26. 26.175 increased by 12% =
27. 27.80 increased by 15% =
28. 28.700 decreased by 10% =
29. 29.380 increased by 5% =
30. 30.650 increased by 8% =
31. 31.354 increased by 50% =
32. 32.320 decreased by 40% =
33. 33.600 increased by 75% =
34. 34.115 increased by 40% =
35. 35.560 decreased by 15% =
36. 36.525 decreased by 20% =
37. 37.220 increased by 30% =
38. 38.680 decreased by 10% =
39. 39.316 increased by 25% =
40. 40.80 increased by 20% =

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