Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 374 · 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. 1.550 increased by 10% =
2. 2.100 increased by 5% =
3. 3.525 decreased by 12% =
4. 4.376 increased by 25% =
5. 5.480 decreased by 15% =
6. 6.204 decreased by 75% =
7. 7.75 increased by 12% =
8. 8.780 increased by 15% =
9. 9.736 decreased by 25% =
10. 10.214 decreased by 50% =
11. 11.400 decreased by 10% =
12. 12.220 increased by 35% =
13. 13.380 increased by 5% =
14. 14.392 decreased by 75% =
15. 15.325 increased by 12% =
16. 16.270 increased by 60% =
17. 17.205 decreased by 40% =
18. 18.740 increased by 5% =
19. 19.300 decreased by 35% =
20. 20.225 decreased by 8% =
21. 21.260 decreased by 20% =
22. 22.575 decreased by 8% =
23. 23.450 increased by 10% =
24. 24.60 increased by 35% =
25. 25.645 increased by 20% =
26. 26.150 increased by 40% =
27. 27.700 decreased by 10% =
28. 28.50 increased by 12% =
29. 29.60 increased by 40% =
30. 30.296 decreased by 75% =
31. 31.180 increased by 5% =
32. 32.70 decreased by 10% =
33. 33.264 decreased by 25% =
34. 34.680 increased by 35% =
35. 35.760 increased by 5% =
36. 36.540 decreased by 15% =
37. 37.800 decreased by 8% =
38. 38.120 decreased by 5% =
39. 39.205 increased by 40% =
40. 40.160 decreased by 10% =

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