Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 316 · 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. 1.780 decreased by 30% =
2. 2.200 decreased by 35% =
3. 3.580 decreased by 10% =
4. 4.312 decreased by 50% =
5. 5.240 increased by 35% =
6. 6.620 decreased by 5% =
7. 7.780 decreased by 5% =
8. 8.220 decreased by 60% =
9. 9.420 decreased by 10% =
10. 10.250 decreased by 8% =
11. 11.280 increased by 5% =
12. 12.515 decreased by 20% =
13. 13.500 decreased by 30% =
14. 14.780 increased by 75% =
15. 15.205 increased by 40% =
16. 16.420 increased by 15% =
17. 17.40 decreased by 15% =
18. 18.275 increased by 12% =
19. 19.475 decreased by 12% =
20. 20.220 decreased by 75% =
21. 21.670 increased by 10% =
22. 22.120 decreased by 15% =
23. 23.596 decreased by 25% =
24. 24.345 decreased by 40% =
25. 25.115 increased by 20% =
26. 26.180 decreased by 30% =
27. 27.660 decreased by 10% =
28. 28.625 decreased by 8% =
29. 29.205 increased by 60% =
30. 30.355 increased by 40% =
31. 31.224 decreased by 50% =
32. 32.500 decreased by 75% =
33. 33.78 increased by 50% =
34. 34.540 increased by 30% =
35. 35.780 increased by 35% =
36. 36.140 decreased by 30% =
37. 37.550 decreased by 60% =
38. 38.270 decreased by 60% =
39. 39.200 increased by 10% =
40. 40.275 increased by 12% =

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