Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 142 · 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. 1.605 increased by 40% =
2. 2.500 increased by 15% =
3. 3.475 increased by 12% =
4. 4.184 decreased by 75% =
5. 5.220 increased by 5% =
6. 6.245 increased by 60% =
7. 7.676 increased by 75% =
8. 8.195 increased by 20% =
9. 9.160 decreased by 35% =
10. 10.346 decreased by 50% =
11. 11.735 decreased by 60% =
12. 12.675 decreased by 12% =
13. 13.736 decreased by 25% =
14. 14.750 increased by 12% =
15. 15.116 decreased by 75% =
16. 16.120 decreased by 15% =
17. 17.620 decreased by 5% =
18. 18.796 increased by 25% =
19. 19.420 decreased by 30% =
20. 20.275 decreased by 8% =
21. 21.540 increased by 5% =
22. 22.772 increased by 75% =
23. 23.525 decreased by 12% =
24. 24.732 increased by 50% =
25. 25.70 increased by 20% =
26. 26.310 increased by 40% =
27. 27.380 decreased by 15% =
28. 28.160 increased by 25% =
29. 29.512 decreased by 25% =
30. 30.190 decreased by 30% =
31. 31.630 decreased by 30% =
32. 32.795 increased by 40% =
33. 33.220 increased by 75% =
34. 34.160 decreased by 10% =
35. 35.350 decreased by 30% =
36. 36.595 increased by 40% =
37. 37.325 increased by 20% =
38. 38.90 increased by 30% =
39. 39.800 increased by 5% =
40. 40.680 increased by 10% =

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