Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 771 · 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. 1.392 decreased by 25% =
2. 2.728 increased by 75% =
3. 3.395 increased by 20% =
4. 4.700 decreased by 35% =
5. 5.50 increased by 30% =
6. 6.380 decreased by 5% =
7. 7.236 increased by 50% =
8. 8.350 decreased by 10% =
9. 9.512 decreased by 75% =
10. 10.340 increased by 25% =
11. 11.756 decreased by 50% =
12. 12.706 increased by 50% =
13. 13.735 increased by 60% =
14. 14.380 decreased by 35% =
15. 15.715 increased by 40% =
16. 16.200 decreased by 35% =
17. 17.148 decreased by 50% =
18. 18.400 decreased by 25% =
19. 19.640 decreased by 15% =
20. 20.48 decreased by 50% =
21. 21.250 decreased by 30% =
22. 22.670 decreased by 10% =
23. 23.300 increased by 30% =
24. 24.334 decreased by 50% =
25. 25.260 decreased by 30% =
26. 26.605 decreased by 60% =
27. 27.592 increased by 25% =
28. 28.284 decreased by 75% =
29. 29.520 decreased by 10% =
30. 30.130 decreased by 10% =
31. 31.80 increased by 15% =
32. 32.715 increased by 60% =
33. 33.660 decreased by 10% =
34. 34.680 decreased by 30% =
35. 35.720 increased by 15% =
36. 36.470 increased by 10% =
37. 37.600 increased by 15% =
38. 38.785 decreased by 60% =
39. 39.580 increased by 15% =
40. 40.765 decreased by 20% =

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