Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 433 · 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. 1.260 increased by 15% =
2. 2.255 decreased by 40% =
3. 3.160 decreased by 15% =
4. 4.360 decreased by 5% =
5. 5.720 decreased by 15% =
6. 6.500 increased by 10% =
7. 7.200 increased by 15% =
8. 8.300 increased by 20% =
9. 9.600 increased by 15% =
10. 10.415 increased by 40% =
11. 11.760 decreased by 25% =
12. 12.256 decreased by 25% =
13. 13.220 decreased by 15% =
14. 14.80 increased by 20% =
15. 15.124 increased by 75% =
16. 16.295 decreased by 60% =
17. 17.300 decreased by 8% =
18. 18.600 increased by 35% =
19. 19.680 increased by 35% =
20. 20.212 decreased by 25% =
21. 21.125 increased by 12% =
22. 22.210 increased by 50% =
23. 23.740 decreased by 10% =
24. 24.400 decreased by 20% =
25. 25.525 increased by 12% =
26. 26.640 decreased by 15% =
27. 27.100 decreased by 8% =
28. 28.305 decreased by 40% =
29. 29.180 decreased by 30% =
30. 30.40 increased by 35% =
31. 31.785 decreased by 60% =
32. 32.100 increased by 12% =
33. 33.750 increased by 30% =
34. 34.175 increased by 8% =
35. 35.160 decreased by 60% =
36. 36.180 increased by 35% =
37. 37.300 decreased by 50% =
38. 38.550 decreased by 40% =
39. 39.600 decreased by 8% =
40. 40.165 increased by 60% =

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