Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 5 · 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. 1.310 increased by 30% =
2. 2.705 decreased by 60% =
3. 3.100 increased by 15% =
4. 4.780 increased by 50% =
5. 5.230 decreased by 20% =
6. 6.700 increased by 30% =
7. 7.216 decreased by 25% =
8. 8.40 increased by 15% =
9. 9.326 decreased by 50% =
10. 10.700 decreased by 10% =
11. 11.652 increased by 75% =
12. 12.425 decreased by 8% =
13. 13.560 increased by 50% =
14. 14.500 increased by 40% =
15. 15.680 increased by 60% =
16. 16.140 increased by 5% =
17. 17.616 increased by 50% =
18. 18.40 increased by 5% =
19. 19.220 decreased by 5% =
20. 20.240 decreased by 15% =
21. 21.390 decreased by 40% =
22. 22.628 decreased by 75% =
23. 23.800 decreased by 15% =
24. 24.100 increased by 8% =
25. 25.320 decreased by 15% =
26. 26.455 increased by 60% =
27. 27.465 increased by 60% =
28. 28.460 increased by 5% =
29. 29.480 increased by 60% =
30. 30.80 increased by 10% =
31. 31.500 increased by 5% =
32. 32.250 increased by 12% =
33. 33.400 increased by 25% =
34. 34.120 increased by 20% =
35. 35.325 increased by 12% =
36. 36.110 increased by 30% =
37. 37.580 decreased by 35% =
38. 38.140 decreased by 15% =
39. 39.450 decreased by 40% =
40. 40.400 increased by 12% =

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