Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 222 · 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. 1.390 increased by 10% =
2. 2.240 decreased by 35% =
3. 3.475 decreased by 12% =
4. 4.200 increased by 20% =
5. 5.208 decreased by 75% =
6. 6.90 decreased by 30% =
7. 7.480 increased by 5% =
8. 8.600 decreased by 5% =
9. 9.635 increased by 40% =
10. 10.260 decreased by 5% =
11. 11.175 decreased by 8% =
12. 12.660 increased by 30% =
13. 13.350 decreased by 12% =
14. 14.760 increased by 35% =
15. 15.100 increased by 8% =
16. 16.760 increased by 15% =
17. 17.668 decreased by 50% =
18. 18.325 decreased by 12% =
19. 19.348 decreased by 25% =
20. 20.656 decreased by 75% =
21. 21.230 increased by 60% =
22. 22.720 increased by 40% =
23. 23.314 increased by 50% =
24. 24.125 decreased by 12% =
25. 25.164 increased by 75% =
26. 26.565 decreased by 40% =
27. 27.695 increased by 60% =
28. 28.300 decreased by 5% =
29. 29.730 increased by 30% =
30. 30.788 increased by 75% =
31. 31.600 increased by 8% =
32. 32.664 increased by 25% =
33. 33.64 decreased by 75% =
34. 34.468 increased by 75% =
35. 35.92 increased by 50% =
36. 36.340 increased by 15% =
37. 37.520 increased by 15% =
38. 38.172 increased by 25% =
39. 39.420 increased by 5% =
40. 40.250 increased by 20% =

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