Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 639 · 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. 1.690 increased by 40% =
2. 2.675 increased by 8% =
3. 3.135 decreased by 40% =
4. 4.380 increased by 15% =
5. 5.550 increased by 12% =
6. 6.625 increased by 8% =
7. 7.280 increased by 20% =
8. 8.240 decreased by 50% =
9. 9.210 increased by 10% =
10. 10.100 decreased by 5% =
11. 11.210 increased by 50% =
12. 12.780 decreased by 50% =
13. 13.782 decreased by 50% =
14. 14.760 increased by 10% =
15. 15.236 increased by 75% =
16. 16.740 decreased by 35% =
17. 17.355 increased by 40% =
18. 18.460 increased by 15% =
19. 19.588 decreased by 75% =
20. 20.375 increased by 12% =
21. 21.400 decreased by 12% =
22. 22.75 decreased by 12% =
23. 23.450 increased by 10% =
24. 24.660 decreased by 30% =
25. 25.400 decreased by 10% =
26. 26.180 decreased by 5% =
27. 27.160 increased by 15% =
28. 28.200 increased by 30% =
29. 29.310 decreased by 40% =
30. 30.794 increased by 50% =
31. 31.80 decreased by 35% =
32. 32.475 decreased by 60% =
33. 33.325 decreased by 8% =
34. 34.78 decreased by 50% =
35. 35.516 decreased by 25% =
36. 36.760 decreased by 10% =
37. 37.188 increased by 75% =
38. 38.600 decreased by 8% =
39. 39.550 decreased by 60% =
40. 40.150 decreased by 12% =

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