Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 930 · 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. 1.500 decreased by 30% =
2. 2.700 increased by 35% =
3. 3.100 increased by 30% =
4. 4.520 decreased by 15% =
5. 5.780 increased by 5% =
6. 6.475 increased by 8% =
7. 7.300 decreased by 60% =
8. 8.220 decreased by 5% =
9. 9.564 increased by 75% =
10. 10.140 decreased by 35% =
11. 11.325 increased by 12% =
12. 12.475 increased by 40% =
13. 13.500 decreased by 15% =
14. 14.794 increased by 50% =
15. 15.510 decreased by 10% =
16. 16.382 decreased by 50% =
17. 17.112 decreased by 25% =
18. 18.548 increased by 25% =
19. 19.140 decreased by 30% =
20. 20.160 increased by 75% =
21. 21.105 decreased by 20% =
22. 22.112 decreased by 50% =
23. 23.100 decreased by 12% =
24. 24.740 decreased by 5% =
25. 25.156 decreased by 75% =
26. 26.500 decreased by 15% =
27. 27.84 increased by 25% =
28. 28.120 increased by 20% =
29. 29.760 increased by 75% =
30. 30.652 decreased by 75% =
31. 31.140 decreased by 15% =
32. 32.346 increased by 50% =
33. 33.230 increased by 20% =
34. 34.108 decreased by 75% =
35. 35.700 increased by 75% =
36. 36.780 decreased by 10% =
37. 37.800 decreased by 15% =
38. 38.60 decreased by 40% =
39. 39.500 increased by 12% =
40. 40.375 increased by 12% =

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