Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 621 · 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. 1.130 increased by 30% =
2. 2.276 increased by 25% =
3. 3.660 increased by 20% =
4. 4.340 decreased by 10% =
5. 5.700 decreased by 35% =
6. 6.484 increased by 50% =
7. 7.125 decreased by 8% =
8. 8.340 increased by 15% =
9. 9.610 increased by 20% =
10. 10.625 decreased by 8% =
11. 11.775 increased by 8% =
12. 12.358 increased by 50% =
13. 13.190 increased by 40% =
14. 14.530 decreased by 20% =
15. 15.280 decreased by 60% =
16. 16.124 increased by 75% =
17. 17.60 decreased by 30% =
18. 18.290 increased by 30% =
19. 19.180 decreased by 20% =
20. 20.380 increased by 15% =
21. 21.510 increased by 10% =
22. 22.540 increased by 25% =
23. 23.360 increased by 15% =
24. 24.380 increased by 20% =
25. 25.40 decreased by 35% =
26. 26.475 increased by 8% =
27. 27.150 decreased by 8% =
28. 28.595 increased by 20% =
29. 29.635 increased by 40% =
30. 30.412 increased by 50% =
31. 31.235 decreased by 20% =
32. 32.575 decreased by 8% =
33. 33.772 increased by 50% =
34. 34.525 increased by 40% =
35. 35.310 decreased by 30% =
36. 36.776 decreased by 75% =
37. 37.50 decreased by 10% =
38. 38.760 decreased by 35% =
39. 39.335 decreased by 60% =
40. 40.80 increased by 15% =

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