Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 904 · 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. 1.120 increased by 10% =
2. 2.345 decreased by 20% =
3. 3.794 increased by 50% =
4. 4.200 increased by 75% =
5. 5.540 increased by 35% =
6. 6.200 decreased by 12% =
7. 7.300 increased by 5% =
8. 8.200 increased by 8% =
9. 9.736 decreased by 25% =
10. 10.585 increased by 60% =
11. 11.700 increased by 12% =
12. 12.640 decreased by 35% =
13. 13.200 decreased by 10% =
14. 14.756 decreased by 50% =
15. 15.90 increased by 10% =
16. 16.276 decreased by 25% =
17. 17.50 decreased by 50% =
18. 18.700 decreased by 5% =
19. 19.390 decreased by 10% =
20. 20.270 decreased by 10% =
21. 21.480 decreased by 5% =
22. 22.475 increased by 12% =
23. 23.85 decreased by 40% =
24. 24.180 decreased by 15% =
25. 25.405 increased by 20% =
26. 26.520 increased by 15% =
27. 27.250 decreased by 30% =
28. 28.400 increased by 12% =
29. 29.705 increased by 20% =
30. 30.80 increased by 30% =
31. 31.608 increased by 25% =
32. 32.150 decreased by 8% =
33. 33.152 decreased by 50% =
34. 34.456 decreased by 50% =
35. 35.430 decreased by 40% =
36. 36.250 decreased by 20% =
37. 37.750 increased by 8% =
38. 38.300 increased by 12% =
39. 39.180 decreased by 15% =
40. 40.125 increased by 8% =

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