Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 519 · 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. 1.90 increased by 20% =
2. 2.460 increased by 35% =
3. 3.415 decreased by 40% =
4. 4.60 increased by 35% =
5. 5.80 increased by 30% =
6. 6.140 decreased by 5% =
7. 7.744 increased by 25% =
8. 8.200 decreased by 12% =
9. 9.600 decreased by 30% =
10. 10.80 increased by 15% =
11. 11.455 increased by 40% =
12. 12.752 decreased by 25% =
13. 13.50 decreased by 12% =
14. 14.516 increased by 50% =
15. 15.320 increased by 10% =
16. 16.500 decreased by 12% =
17. 17.220 increased by 40% =
18. 18.60 decreased by 15% =
19. 19.180 increased by 20% =
20. 20.75 increased by 8% =
21. 21.522 decreased by 50% =
22. 22.240 increased by 30% =
23. 23.260 increased by 75% =
24. 24.500 decreased by 35% =
25. 25.624 decreased by 25% =
26. 26.445 increased by 20% =
27. 27.800 increased by 10% =
28. 28.520 decreased by 75% =
29. 29.240 increased by 35% =
30. 30.75 decreased by 12% =
31. 31.250 decreased by 10% =
32. 32.350 increased by 8% =
33. 33.712 increased by 25% =
34. 34.400 decreased by 12% =
35. 35.55 increased by 40% =
36. 36.185 decreased by 20% =
37. 37.600 decreased by 15% =
38. 38.560 decreased by 40% =
39. 39.328 decreased by 25% =
40. 40.660 decreased by 10% =

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