Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 567 · 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. 1.780 decreased by 15% =
2. 2.92 increased by 75% =
3. 3.520 increased by 15% =
4. 4.600 increased by 35% =
5. 5.580 increased by 15% =
6. 6.128 increased by 75% =
7. 7.412 increased by 25% =
8. 8.186 decreased by 50% =
9. 9.220 decreased by 30% =
10. 10.250 decreased by 10% =
11. 11.640 increased by 15% =
12. 12.250 decreased by 8% =
13. 13.700 decreased by 5% =
14. 14.670 increased by 10% =
15. 15.290 decreased by 30% =
16. 16.748 increased by 25% =
17. 17.50 increased by 12% =
18. 18.600 increased by 20% =
19. 19.180 decreased by 15% =
20. 20.78 increased by 50% =
21. 21.285 decreased by 60% =
22. 22.50 decreased by 12% =
23. 23.760 decreased by 30% =
24. 24.150 increased by 12% =
25. 25.60 increased by 40% =
26. 26.500 increased by 40% =
27. 27.136 decreased by 75% =
28. 28.450 increased by 10% =
29. 29.780 increased by 25% =
30. 30.660 decreased by 5% =
31. 31.325 decreased by 20% =
32. 32.608 decreased by 75% =
33. 33.220 increased by 20% =
34. 34.460 increased by 30% =
35. 35.225 decreased by 12% =
36. 36.115 increased by 20% =
37. 37.325 decreased by 8% =
38. 38.710 decreased by 20% =
39. 39.180 increased by 30% =
40. 40.675 increased by 12% =

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