Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 198 · 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. 1.140 increased by 5% =
2. 2.470 decreased by 40% =
3. 3.605 decreased by 20% =
4. 4.125 increased by 8% =
5. 5.700 increased by 20% =
6. 6.100 increased by 15% =
7. 7.675 decreased by 40% =
8. 8.380 increased by 20% =
9. 9.50 decreased by 30% =
10. 10.175 increased by 8% =
11. 11.340 decreased by 15% =
12. 12.325 decreased by 8% =
13. 13.650 increased by 12% =
14. 14.476 decreased by 75% =
15. 15.415 increased by 40% =
16. 16.670 increased by 10% =
17. 17.250 decreased by 40% =
18. 18.80 decreased by 60% =
19. 19.488 increased by 25% =
20. 20.90 decreased by 20% =
21. 21.475 increased by 8% =
22. 22.228 increased by 75% =
23. 23.550 decreased by 8% =
24. 24.145 increased by 40% =
25. 25.735 increased by 60% =
26. 26.360 increased by 15% =
27. 27.145 increased by 40% =
28. 28.150 increased by 8% =
29. 29.600 increased by 15% =
30. 30.50 decreased by 30% =
31. 31.680 increased by 25% =
32. 32.570 decreased by 50% =
33. 33.196 increased by 25% =
34. 34.60 decreased by 75% =
35. 35.200 increased by 8% =
36. 36.660 decreased by 60% =
37. 37.50 increased by 8% =
38. 38.150 increased by 40% =
39. 39.775 increased by 8% =
40. 40.485 increased by 20% =

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