Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 310 · 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. 1.635 increased by 40% =
2. 2.620 decreased by 35% =
3. 3.100 decreased by 35% =
4. 4.360 increased by 35% =
5. 5.375 increased by 8% =
6. 6.600 increased by 30% =
7. 7.212 increased by 50% =
8. 8.535 decreased by 20% =
9. 9.495 decreased by 40% =
10. 10.496 increased by 25% =
11. 11.76 increased by 25% =
12. 12.120 increased by 35% =
13. 13.580 decreased by 30% =
14. 14.675 decreased by 8% =
15. 15.200 decreased by 30% =
16. 16.760 increased by 10% =
17. 17.800 decreased by 5% =
18. 18.640 decreased by 75% =
19. 19.310 decreased by 60% =
20. 20.340 decreased by 15% =
21. 21.550 increased by 12% =
22. 22.275 decreased by 8% =
23. 23.620 decreased by 10% =
24. 24.675 increased by 20% =
25. 25.420 decreased by 20% =
26. 26.168 increased by 50% =
27. 27.225 decreased by 20% =
28. 28.475 decreased by 12% =
29. 29.156 increased by 25% =
30. 30.320 decreased by 15% =
31. 31.396 increased by 75% =
32. 32.760 decreased by 5% =
33. 33.576 increased by 25% =
34. 34.424 decreased by 50% =
35. 35.60 decreased by 5% =
36. 36.290 decreased by 60% =
37. 37.440 increased by 5% =
38. 38.800 increased by 25% =
39. 39.40 increased by 15% =
40. 40.40 increased by 35% =

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