Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 187 · 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. 1.155 increased by 20% =
2. 2.640 decreased by 5% =
3. 3.700 increased by 12% =
4. 4.635 increased by 60% =
5. 5.272 increased by 25% =
6. 6.400 increased by 40% =
7. 7.440 decreased by 35% =
8. 8.634 increased by 50% =
9. 9.335 decreased by 60% =
10. 10.350 decreased by 40% =
11. 11.536 increased by 50% =
12. 12.322 increased by 50% =
13. 13.480 decreased by 15% =
14. 14.670 decreased by 40% =
15. 15.280 increased by 15% =
16. 16.408 decreased by 50% =
17. 17.305 decreased by 40% =
18. 18.330 increased by 40% =
19. 19.560 increased by 20% =
20. 20.110 increased by 60% =
21. 21.780 decreased by 5% =
22. 22.490 increased by 10% =
23. 23.125 decreased by 8% =
24. 24.100 decreased by 12% =
25. 25.340 increased by 15% =
26. 26.120 decreased by 15% =
27. 27.800 decreased by 20% =
28. 28.800 decreased by 8% =
29. 29.545 increased by 20% =
30. 30.800 increased by 8% =
31. 31.540 increased by 50% =
32. 32.60 increased by 35% =
33. 33.340 increased by 35% =
34. 34.145 increased by 40% =
35. 35.625 increased by 60% =
36. 36.175 decreased by 12% =
37. 37.705 decreased by 60% =
38. 38.640 decreased by 40% =
39. 39.350 increased by 12% =
40. 40.110 decreased by 10% =

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