Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 766 · 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. 1.740 decreased by 30% =
2. 2.584 increased by 50% =
3. 3.760 increased by 35% =
4. 4.775 increased by 12% =
5. 5.515 decreased by 40% =
6. 6.468 decreased by 50% =
7. 7.45 increased by 20% =
8. 8.50 decreased by 10% =
9. 9.560 decreased by 15% =
10. 10.275 increased by 8% =
11. 11.480 increased by 5% =
12. 12.740 decreased by 30% =
13. 13.500 decreased by 5% =
14. 14.325 decreased by 8% =
15. 15.125 increased by 12% =
16. 16.148 increased by 25% =
17. 17.780 increased by 35% =
18. 18.200 increased by 12% =
19. 19.760 increased by 5% =
20. 20.240 decreased by 15% =
21. 21.100 increased by 15% =
22. 22.405 decreased by 40% =
23. 23.550 decreased by 12% =
24. 24.188 decreased by 75% =
25. 25.530 decreased by 10% =
26. 26.664 decreased by 25% =
27. 27.270 decreased by 60% =
28. 28.380 decreased by 40% =
29. 29.640 increased by 15% =
30. 30.775 increased by 12% =
31. 31.320 decreased by 5% =
32. 32.340 increased by 35% =
33. 33.444 increased by 25% =
34. 34.260 decreased by 75% =
35. 35.695 decreased by 60% =
36. 36.150 decreased by 10% =
37. 37.430 increased by 20% =
38. 38.102 increased by 50% =
39. 39.675 decreased by 12% =
40. 40.744 decreased by 25% =

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