Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 431 · 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. 1.390 decreased by 30% =
2. 2.95 increased by 20% =
3. 3.740 decreased by 15% =
4. 4.88 increased by 75% =
5. 5.44 decreased by 25% =
6. 6.50 decreased by 12% =
7. 7.230 increased by 60% =
8. 8.784 increased by 25% =
9. 9.50 decreased by 10% =
10. 10.168 increased by 50% =
11. 11.608 increased by 75% =
12. 12.280 increased by 5% =
13. 13.780 decreased by 40% =
14. 14.575 decreased by 12% =
15. 15.508 increased by 75% =
16. 16.100 decreased by 15% =
17. 17.325 decreased by 60% =
18. 18.65 increased by 20% =
19. 19.328 increased by 25% =
20. 20.180 increased by 30% =
21. 21.260 increased by 5% =
22. 22.375 increased by 8% =
23. 23.640 increased by 35% =
24. 24.780 decreased by 25% =
25. 25.175 decreased by 60% =
26. 26.200 increased by 5% =
27. 27.760 increased by 50% =
28. 28.400 decreased by 15% =
29. 29.100 increased by 35% =
30. 30.240 increased by 10% =
31. 31.465 decreased by 40% =
32. 32.240 increased by 60% =
33. 33.60 decreased by 10% =
34. 34.650 increased by 12% =
35. 35.140 increased by 60% =
36. 36.300 increased by 5% =
37. 37.170 increased by 50% =
38. 38.80 increased by 35% =
39. 39.600 decreased by 12% =
40. 40.60 increased by 15% =

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