Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 302 · 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. 1.120 decreased by 30% =
2. 2.120 increased by 25% =
3. 3.100 decreased by 35% =
4. 4.530 decreased by 30% =
5. 5.200 decreased by 8% =
6. 6.775 decreased by 40% =
7. 7.230 increased by 10% =
8. 8.240 increased by 10% =
9. 9.450 decreased by 40% =
10. 10.400 decreased by 12% =
11. 11.350 increased by 12% =
12. 12.600 increased by 5% =
13. 13.344 decreased by 50% =
14. 14.600 increased by 5% =
15. 15.228 decreased by 25% =
16. 16.325 decreased by 8% =
17. 17.396 decreased by 25% =
18. 18.340 decreased by 35% =
19. 19.215 decreased by 60% =
20. 20.580 decreased by 5% =
21. 21.315 decreased by 20% =
22. 22.460 increased by 60% =
23. 23.44 decreased by 25% =
24. 24.636 decreased by 50% =
25. 25.112 decreased by 25% =
26. 26.485 decreased by 20% =
27. 27.396 increased by 25% =
28. 28.370 increased by 10% =
29. 29.300 increased by 8% =
30. 30.420 increased by 5% =
31. 31.230 decreased by 40% =
32. 32.60 decreased by 30% =
33. 33.300 decreased by 5% =
34. 34.488 increased by 75% =
35. 35.544 increased by 25% =
36. 36.660 decreased by 5% =
37. 37.470 decreased by 30% =
38. 38.792 decreased by 75% =
39. 39.175 increased by 8% =
40. 40.712 increased by 50% =

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