Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 749 · 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. 1.212 decreased by 25% =
2. 2.116 decreased by 75% =
3. 3.50 decreased by 10% =
4. 4.660 increased by 15% =
5. 5.674 increased by 50% =
6. 6.320 increased by 35% =
7. 7.670 decreased by 50% =
8. 8.300 increased by 12% =
9. 9.380 decreased by 5% =
10. 10.330 increased by 20% =
11. 11.90 increased by 10% =
12. 12.535 decreased by 20% =
13. 13.380 increased by 30% =
14. 14.116 decreased by 50% =
15. 15.332 increased by 25% =
16. 16.540 increased by 35% =
17. 17.366 increased by 50% =
18. 18.300 decreased by 15% =
19. 19.180 increased by 5% =
20. 20.350 decreased by 12% =
21. 21.380 increased by 15% =
22. 22.495 increased by 60% =
23. 23.345 increased by 20% =
24. 24.495 increased by 20% =
25. 25.675 increased by 12% =
26. 26.180 decreased by 35% =
27. 27.324 decreased by 25% =
28. 28.800 increased by 5% =
29. 29.310 increased by 30% =
30. 30.710 decreased by 60% =
31. 31.196 increased by 75% =
32. 32.75 increased by 12% =
33. 33.475 decreased by 60% =
34. 34.96 increased by 75% =
35. 35.456 increased by 25% =
36. 36.784 increased by 25% =
37. 37.300 increased by 35% =
38. 38.565 decreased by 60% =
39. 39.632 increased by 50% =
40. 40.600 decreased by 8% =

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