Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 767 · 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. 1.210 decreased by 60% =
2. 2.60 decreased by 75% =
3. 3.335 decreased by 40% =
4. 4.328 decreased by 75% =
5. 5.260 increased by 35% =
6. 6.46 increased by 50% =
7. 7.575 increased by 40% =
8. 8.60 increased by 15% =
9. 9.316 increased by 50% =
10. 10.240 increased by 5% =
11. 11.430 increased by 60% =
12. 12.775 increased by 8% =
13. 13.325 increased by 20% =
14. 14.560 increased by 35% =
15. 15.250 decreased by 30% =
16. 16.540 decreased by 10% =
17. 17.330 decreased by 10% =
18. 18.275 increased by 8% =
19. 19.796 decreased by 25% =
20. 20.500 decreased by 15% =
21. 21.385 increased by 40% =
22. 22.250 increased by 20% =
23. 23.300 increased by 12% =
24. 24.780 decreased by 15% =
25. 25.140 decreased by 20% =
26. 26.92 decreased by 75% =
27. 27.430 decreased by 10% =
28. 28.724 increased by 75% =
29. 29.405 decreased by 20% =
30. 30.250 increased by 12% =
31. 31.520 decreased by 35% =
32. 32.645 increased by 40% =
33. 33.360 increased by 15% =
34. 34.250 increased by 12% =
35. 35.500 decreased by 10% =
36. 36.660 decreased by 30% =
37. 37.340 increased by 5% =
38. 38.104 increased by 75% =
39. 39.425 decreased by 12% =
40. 40.280 decreased by 15% =

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