Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 160 · 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. 1.464 decreased by 50% =
2. 2.230 increased by 30% =
3. 3.500 decreased by 35% =
4. 4.540 increased by 20% =
5. 5.140 increased by 35% =
6. 6.780 decreased by 5% =
7. 7.475 decreased by 8% =
8. 8.100 decreased by 75% =
9. 9.520 decreased by 25% =
10. 10.605 increased by 20% =
11. 11.320 decreased by 15% =
12. 12.320 decreased by 35% =
13. 13.200 decreased by 5% =
14. 14.450 increased by 12% =
15. 15.280 decreased by 30% =
16. 16.170 increased by 20% =
17. 17.205 increased by 20% =
18. 18.240 decreased by 10% =
19. 19.785 decreased by 40% =
20. 20.674 decreased by 50% =
21. 21.395 increased by 60% =
22. 22.300 decreased by 12% =
23. 23.76 increased by 25% =
24. 24.400 decreased by 20% =
25. 25.380 increased by 35% =
26. 26.220 increased by 15% =
27. 27.220 decreased by 5% =
28. 28.342 increased by 50% =
29. 29.488 decreased by 50% =
30. 30.525 increased by 60% =
31. 31.654 increased by 50% =
32. 32.495 increased by 40% =
33. 33.70 decreased by 10% =
34. 34.600 increased by 35% =
35. 35.600 increased by 40% =
36. 36.320 decreased by 35% =
37. 37.484 increased by 50% =
38. 38.360 increased by 15% =
39. 39.250 decreased by 8% =
40. 40.585 decreased by 60% =

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