Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 921 · 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. 1.800 increased by 30% =
2. 2.288 decreased by 75% =
3. 3.250 increased by 8% =
4. 4.720 decreased by 30% =
5. 5.145 decreased by 60% =
6. 6.612 increased by 25% =
7. 7.680 decreased by 35% =
8. 8.300 decreased by 25% =
9. 9.425 decreased by 20% =
10. 10.640 increased by 30% =
11. 11.650 increased by 8% =
12. 12.505 decreased by 60% =
13. 13.500 decreased by 8% =
14. 14.620 decreased by 10% =
15. 15.420 increased by 35% =
16. 16.735 increased by 60% =
17. 17.200 increased by 10% =
18. 18.108 increased by 50% =
19. 19.415 increased by 20% =
20. 20.285 increased by 60% =
21. 21.525 decreased by 60% =
22. 22.540 increased by 15% =
23. 23.180 increased by 30% =
24. 24.500 decreased by 10% =
25. 25.280 increased by 30% =
26. 26.400 increased by 35% =
27. 27.724 decreased by 75% =
28. 28.524 increased by 25% =
29. 29.275 increased by 20% =
30. 30.220 increased by 15% =
31. 31.75 increased by 40% =
32. 32.640 decreased by 60% =
33. 33.320 increased by 75% =
34. 34.280 decreased by 30% =
35. 35.210 decreased by 40% =
36. 36.200 increased by 75% =
37. 37.195 increased by 60% =
38. 38.675 increased by 12% =
39. 39.130 increased by 30% =
40. 40.525 decreased by 20% =

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