Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 990 · 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. 1.320 decreased by 5% =
2. 2.600 increased by 8% =
3. 3.260 increased by 35% =
4. 4.204 increased by 75% =
5. 5.330 decreased by 40% =
6. 6.796 increased by 25% =
7. 7.180 decreased by 10% =
8. 8.565 increased by 40% =
9. 9.775 decreased by 8% =
10. 10.100 decreased by 15% =
11. 11.750 increased by 12% =
12. 12.625 increased by 12% =
13. 13.120 increased by 35% =
14. 14.710 decreased by 10% =
15. 15.500 increased by 5% =
16. 16.336 decreased by 75% =
17. 17.275 increased by 12% =
18. 18.84 decreased by 75% =
19. 19.780 decreased by 10% =
20. 20.588 increased by 50% =
21. 21.550 increased by 20% =
22. 22.55 increased by 20% =
23. 23.360 decreased by 15% =
24. 24.620 increased by 20% =
25. 25.240 decreased by 35% =
26. 26.270 increased by 10% =
27. 27.460 decreased by 60% =
28. 28.760 increased by 15% =
29. 29.75 increased by 12% =
30. 30.280 decreased by 60% =
31. 31.560 increased by 10% =
32. 32.508 decreased by 50% =
33. 33.50 decreased by 20% =
34. 34.125 increased by 60% =
35. 35.300 increased by 12% =
36. 36.480 decreased by 5% =
37. 37.400 increased by 15% =
38. 38.375 decreased by 8% =
39. 39.100 decreased by 8% =
40. 40.650 increased by 12% =

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