Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 379 · 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. 1.636 increased by 75% =
2. 2.500 increased by 15% =
3. 3.625 increased by 8% =
4. 4.230 decreased by 10% =
5. 5.280 increased by 15% =
6. 6.700 increased by 5% =
7. 7.400 decreased by 35% =
8. 8.60 decreased by 5% =
9. 9.92 increased by 25% =
10. 10.390 decreased by 30% =
11. 11.110 increased by 40% =
12. 12.320 increased by 15% =
13. 13.120 increased by 60% =
14. 14.108 increased by 75% =
15. 15.460 decreased by 30% =
16. 16.120 decreased by 15% =
17. 17.275 increased by 12% =
18. 18.590 increased by 30% =
19. 19.175 decreased by 8% =
20. 20.65 increased by 20% =
21. 21.220 decreased by 10% =
22. 22.650 decreased by 30% =
23. 23.110 increased by 20% =
24. 24.475 increased by 12% =
25. 25.250 increased by 8% =
26. 26.215 decreased by 60% =
27. 27.250 decreased by 30% =
28. 28.185 increased by 60% =
29. 29.350 increased by 30% =
30. 30.662 increased by 50% =
31. 31.464 increased by 50% =
32. 32.440 increased by 15% =
33. 33.644 increased by 75% =
34. 34.158 increased by 50% =
35. 35.495 increased by 20% =
36. 36.575 decreased by 12% =
37. 37.650 decreased by 12% =
38. 38.625 decreased by 8% =
39. 39.525 decreased by 8% =
40. 40.160 increased by 10% =

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