Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 658 · 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. 1.450 increased by 8% =
2. 2.110 decreased by 30% =
3. 3.360 decreased by 15% =
4. 4.190 increased by 10% =
5. 5.230 increased by 30% =
6. 6.660 decreased by 35% =
7. 7.100 increased by 8% =
8. 8.385 increased by 20% =
9. 9.550 increased by 12% =
10. 10.502 decreased by 50% =
11. 11.380 decreased by 15% =
12. 12.504 increased by 50% =
13. 13.185 increased by 60% =
14. 14.580 decreased by 40% =
15. 15.340 increased by 15% =
16. 16.550 decreased by 12% =
17. 17.540 increased by 50% =
18. 18.256 decreased by 75% =
19. 19.140 decreased by 35% =
20. 20.370 increased by 60% =
21. 21.315 decreased by 40% =
22. 22.345 decreased by 40% =
23. 23.85 decreased by 40% =
24. 24.80 decreased by 30% =
25. 25.616 decreased by 75% =
26. 26.98 increased by 50% =
27. 27.448 increased by 25% =
28. 28.480 increased by 15% =
29. 29.780 increased by 30% =
30. 30.250 decreased by 40% =
31. 31.125 increased by 12% =
32. 32.200 decreased by 15% =
33. 33.215 increased by 20% =
34. 34.180 decreased by 35% =
35. 35.800 increased by 35% =
36. 36.700 increased by 8% =
37. 37.524 increased by 25% =
38. 38.516 increased by 25% =
39. 39.520 increased by 15% =
40. 40.452 decreased by 75% =

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