Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 549 · 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. 1.400 decreased by 75% =
2. 2.100 increased by 15% =
3. 3.560 decreased by 5% =
4. 4.100 increased by 8% =
5. 5.356 decreased by 75% =
6. 6.250 decreased by 12% =
7. 7.420 increased by 5% =
8. 8.172 decreased by 25% =
9. 9.540 decreased by 15% =
10. 10.160 increased by 5% =
11. 11.670 increased by 40% =
12. 12.780 increased by 40% =
13. 13.130 increased by 20% =
14. 14.560 increased by 15% =
15. 15.155 increased by 20% =
16. 16.400 increased by 35% =
17. 17.600 increased by 5% =
18. 18.110 increased by 30% =
19. 19.690 decreased by 10% =
20. 20.615 increased by 40% =
21. 21.400 increased by 30% =
22. 22.50 increased by 12% =
23. 23.740 increased by 10% =
24. 24.520 decreased by 50% =
25. 25.380 increased by 30% =
26. 26.180 decreased by 20% =
27. 27.380 increased by 5% =
28. 28.140 decreased by 15% =
29. 29.760 increased by 15% =
30. 30.140 increased by 25% =
31. 31.330 decreased by 30% =
32. 32.230 decreased by 60% =
33. 33.175 decreased by 8% =
34. 34.676 increased by 25% =
35. 35.780 increased by 40% =
36. 36.740 increased by 5% =
37. 37.175 increased by 12% =
38. 38.705 increased by 20% =
39. 39.555 decreased by 60% =
40. 40.345 increased by 40% =

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