Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 888 · 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. 1.520 increased by 10% =
2. 2.525 increased by 12% =
3. 3.60 decreased by 25% =
4. 4.104 decreased by 75% =
5. 5.650 increased by 20% =
6. 6.605 decreased by 60% =
7. 7.120 increased by 35% =
8. 8.445 decreased by 40% =
9. 9.800 increased by 15% =
10. 10.780 increased by 20% =
11. 11.590 decreased by 60% =
12. 12.324 decreased by 75% =
13. 13.124 decreased by 75% =
14. 14.450 decreased by 8% =
15. 15.75 increased by 60% =
16. 16.430 increased by 10% =
17. 17.630 increased by 30% =
18. 18.680 increased by 10% =
19. 19.670 decreased by 60% =
20. 20.560 decreased by 30% =
21. 21.500 increased by 35% =
22. 22.180 increased by 35% =
23. 23.455 decreased by 60% =
24. 24.530 increased by 10% =
25. 25.640 decreased by 30% =
26. 26.202 increased by 50% =
27. 27.512 increased by 75% =
28. 28.580 decreased by 5% =
29. 29.255 increased by 40% =
30. 30.296 decreased by 75% =
31. 31.435 increased by 20% =
32. 32.630 increased by 10% =
33. 33.500 increased by 20% =
34. 34.510 decreased by 20% =
35. 35.332 increased by 50% =
36. 36.216 increased by 75% =
37. 37.60 increased by 15% =
38. 38.260 decreased by 15% =
39. 39.220 decreased by 5% =
40. 40.500 decreased by 20% =

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