Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 578 · 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. 1.745 decreased by 60% =
2. 2.340 decreased by 35% =
3. 3.160 increased by 25% =
4. 4.724 increased by 50% =
5. 5.730 decreased by 60% =
6. 6.340 increased by 5% =
7. 7.690 decreased by 60% =
8. 8.325 increased by 8% =
9. 9.550 decreased by 8% =
10. 10.115 decreased by 20% =
11. 11.480 decreased by 5% =
12. 12.175 increased by 12% =
13. 13.122 increased by 50% =
14. 14.80 increased by 60% =
15. 15.760 increased by 75% =
16. 16.580 increased by 5% =
17. 17.425 increased by 8% =
18. 18.760 decreased by 15% =
19. 19.660 increased by 40% =
20. 20.315 decreased by 20% =
21. 21.610 decreased by 10% =
22. 22.430 decreased by 20% =
23. 23.190 increased by 20% =
24. 24.300 increased by 35% =
25. 25.80 increased by 60% =
26. 26.480 increased by 5% =
27. 27.600 decreased by 15% =
28. 28.235 increased by 20% =
29. 29.375 increased by 12% =
30. 30.788 decreased by 25% =
31. 31.150 increased by 12% =
32. 32.780 decreased by 15% =
33. 33.70 increased by 50% =
34. 34.608 increased by 25% =
35. 35.328 increased by 25% =
36. 36.765 increased by 20% =
37. 37.140 decreased by 30% =
38. 38.700 decreased by 30% =
39. 39.658 decreased by 50% =
40. 40.430 increased by 10% =

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