Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 44 · 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. 1.44 increased by 75% =
2. 2.250 decreased by 20% =
3. 3.426 decreased by 50% =
4. 4.355 decreased by 40% =
5. 5.524 increased by 25% =
6. 6.516 increased by 75% =
7. 7.700 increased by 30% =
8. 8.675 increased by 20% =
9. 9.170 increased by 20% =
10. 10.172 increased by 50% =
11. 11.285 decreased by 60% =
12. 12.200 increased by 30% =
13. 13.220 increased by 10% =
14. 14.760 decreased by 75% =
15. 15.355 increased by 20% =
16. 16.400 increased by 15% =
17. 17.246 increased by 50% =
18. 18.425 increased by 12% =
19. 19.165 decreased by 20% =
20. 20.760 increased by 75% =
21. 21.115 increased by 40% =
22. 22.700 decreased by 75% =
23. 23.560 increased by 15% =
24. 24.400 decreased by 12% =
25. 25.516 increased by 50% =
26. 26.240 decreased by 75% =
27. 27.340 decreased by 15% =
28. 28.40 decreased by 50% =
29. 29.530 increased by 30% =
30. 30.190 increased by 60% =
31. 31.650 increased by 8% =
32. 32.235 increased by 20% =
33. 33.376 decreased by 75% =
34. 34.60 increased by 15% =
35. 35.630 decreased by 10% =
36. 36.325 decreased by 8% =
37. 37.572 increased by 25% =
38. 38.95 decreased by 20% =
39. 39.140 increased by 75% =
40. 40.160 increased by 10% =

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