Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 962 · 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. 1.90 decreased by 30% =
2. 2.375 decreased by 60% =
3. 3.756 increased by 50% =
4. 4.780 increased by 30% =
5. 5.220 decreased by 5% =
6. 6.532 decreased by 25% =
7. 7.380 decreased by 5% =
8. 8.670 increased by 30% =
9. 9.280 decreased by 35% =
10. 10.520 decreased by 15% =
11. 11.192 increased by 75% =
12. 12.245 decreased by 40% =
13. 13.425 increased by 60% =
14. 14.440 decreased by 75% =
15. 15.525 increased by 12% =
16. 16.440 decreased by 15% =
17. 17.590 decreased by 30% =
18. 18.100 decreased by 10% =
19. 19.235 increased by 40% =
20. 20.250 decreased by 8% =
21. 21.708 increased by 25% =
22. 22.486 increased by 50% =
23. 23.380 increased by 20% =
24. 24.100 decreased by 10% =
25. 25.750 decreased by 40% =
26. 26.175 decreased by 20% =
27. 27.324 decreased by 50% =
28. 28.324 decreased by 25% =
29. 29.250 decreased by 10% =
30. 30.640 decreased by 35% =
31. 31.460 increased by 15% =
32. 32.172 decreased by 50% =
33. 33.520 increased by 40% =
34. 34.325 increased by 12% =
35. 35.675 increased by 8% =
36. 36.780 increased by 5% =
37. 37.125 increased by 20% =
38. 38.312 decreased by 50% =
39. 39.548 increased by 25% =
40. 40.420 increased by 15% =

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