Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 109 · 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. 1.190 increased by 20% =
2. 2.184 decreased by 75% =
3. 3.75 decreased by 60% =
4. 4.240 increased by 30% =
5. 5.700 increased by 35% =
6. 6.300 increased by 12% =
7. 7.75 decreased by 12% =
8. 8.635 increased by 20% =
9. 9.250 increased by 12% =
10. 10.640 increased by 40% =
11. 11.234 decreased by 50% =
12. 12.420 decreased by 10% =
13. 13.635 increased by 20% =
14. 14.140 decreased by 10% =
15. 15.616 decreased by 25% =
16. 16.368 decreased by 25% =
17. 17.570 increased by 60% =
18. 18.330 decreased by 10% =
19. 19.72 increased by 25% =
20. 20.165 increased by 40% =
21. 21.480 decreased by 30% =
22. 22.600 increased by 35% =
23. 23.50 increased by 8% =
24. 24.200 decreased by 30% =
25. 25.780 increased by 20% =
26. 26.108 increased by 75% =
27. 27.275 decreased by 8% =
28. 28.90 increased by 40% =
29. 29.740 increased by 5% =
30. 30.375 increased by 8% =
31. 31.780 decreased by 40% =
32. 32.200 decreased by 8% =
33. 33.792 increased by 75% =
34. 34.790 decreased by 40% =
35. 35.65 decreased by 60% =
36. 36.300 increased by 30% =
37. 37.690 increased by 10% =
38. 38.750 decreased by 10% =
39. 39.698 increased by 50% =
40. 40.360 increased by 35% =

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