Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 300 · 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. 1.410 increased by 30% =
2. 2.104 increased by 75% =
3. 3.660 increased by 15% =
4. 4.785 decreased by 40% =
5. 5.220 increased by 30% =
6. 6.180 decreased by 35% =
7. 7.580 increased by 30% =
8. 8.220 increased by 75% =
9. 9.184 decreased by 25% =
10. 10.604 increased by 25% =
11. 11.650 decreased by 20% =
12. 12.660 increased by 5% =
13. 13.544 increased by 75% =
14. 14.114 increased by 50% =
15. 15.550 increased by 8% =
16. 16.275 decreased by 8% =
17. 17.545 increased by 20% =
18. 18.610 decreased by 10% =
19. 19.280 decreased by 60% =
20. 20.496 decreased by 50% =
21. 21.675 increased by 8% =
22. 22.175 increased by 12% =
23. 23.60 increased by 20% =
24. 24.406 decreased by 50% =
25. 25.376 increased by 75% =
26. 26.450 increased by 8% =
27. 27.64 decreased by 75% =
28. 28.80 increased by 30% =
29. 29.560 decreased by 30% =
30. 30.360 decreased by 30% =
31. 31.94 decreased by 50% =
32. 32.240 increased by 5% =
33. 33.776 decreased by 75% =
34. 34.185 increased by 40% =
35. 35.40 increased by 35% =
36. 36.436 increased by 25% =
37. 37.275 decreased by 12% =
38. 38.370 increased by 40% =
39. 39.132 decreased by 50% =
40. 40.400 decreased by 5% =

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