Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 384 · 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. 1.780 increased by 10% =
2. 2.390 decreased by 30% =
3. 3.210 increased by 60% =
4. 4.426 increased by 50% =
5. 5.250 decreased by 8% =
6. 6.680 increased by 5% =
7. 7.100 increased by 8% =
8. 8.200 decreased by 8% =
9. 9.410 increased by 40% =
10. 10.320 decreased by 60% =
11. 11.338 increased by 50% =
12. 12.420 increased by 10% =
13. 13.160 increased by 10% =
14. 14.580 increased by 10% =
15. 15.660 decreased by 60% =
16. 16.190 increased by 10% =
17. 17.220 increased by 50% =
18. 18.480 increased by 5% =
19. 19.40 increased by 50% =
20. 20.776 increased by 75% =
21. 21.696 decreased by 50% =
22. 22.225 decreased by 8% =
23. 23.330 increased by 10% =
24. 24.700 decreased by 20% =
25. 25.40 increased by 20% =
26. 26.750 increased by 8% =
27. 27.715 decreased by 40% =
28. 28.690 increased by 30% =
29. 29.52 increased by 75% =
30. 30.760 increased by 15% =
31. 31.500 decreased by 12% =
32. 32.498 decreased by 50% =
33. 33.160 decreased by 60% =
34. 34.760 increased by 5% =
35. 35.425 increased by 8% =
36. 36.390 increased by 50% =
37. 37.80 increased by 40% =
38. 38.770 decreased by 10% =
39. 39.160 increased by 5% =
40. 40.410 increased by 40% =

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