Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 655 · 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. 1.730 decreased by 40% =
2. 2.600 increased by 35% =
3. 3.75 increased by 8% =
4. 4.520 increased by 10% =
5. 5.184 increased by 75% =
6. 6.270 increased by 20% =
7. 7.800 decreased by 8% =
8. 8.70 decreased by 10% =
9. 9.625 increased by 8% =
10. 10.505 increased by 60% =
11. 11.120 decreased by 60% =
12. 12.45 increased by 40% =
13. 13.320 decreased by 10% =
14. 14.792 decreased by 75% =
15. 15.790 decreased by 30% =
16. 16.440 decreased by 5% =
17. 17.475 increased by 8% =
18. 18.740 decreased by 5% =
19. 19.295 decreased by 20% =
20. 20.790 increased by 40% =
21. 21.628 decreased by 75% =
22. 22.100 increased by 35% =
23. 23.282 increased by 50% =
24. 24.440 decreased by 60% =
25. 25.80 increased by 40% =
26. 26.100 increased by 60% =
27. 27.320 decreased by 35% =
28. 28.150 increased by 12% =
29. 29.520 decreased by 35% =
30. 30.340 decreased by 5% =
31. 31.780 decreased by 30% =
32. 32.80 decreased by 15% =
33. 33.700 decreased by 12% =
34. 34.450 decreased by 12% =
35. 35.152 decreased by 75% =
36. 36.405 increased by 40% =
37. 37.240 increased by 75% =
38. 38.215 increased by 40% =
39. 39.375 increased by 40% =
40. 40.480 decreased by 30% =

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