Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 620 · 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. 1.200 increased by 50% =
2. 2.275 decreased by 12% =
3. 3.600 increased by 30% =
4. 4.405 decreased by 20% =
5. 5.158 decreased by 50% =
6. 6.226 decreased by 50% =
7. 7.440 increased by 5% =
8. 8.292 increased by 50% =
9. 9.325 increased by 60% =
10. 10.255 increased by 40% =
11. 11.215 increased by 40% =
12. 12.730 decreased by 20% =
13. 13.80 increased by 35% =
14. 14.310 increased by 20% =
15. 15.440 increased by 10% =
16. 16.225 increased by 60% =
17. 17.200 increased by 75% =
18. 18.685 decreased by 60% =
19. 19.56 decreased by 75% =
20. 20.680 increased by 35% =
21. 21.800 increased by 50% =
22. 22.165 decreased by 40% =
23. 23.800 decreased by 5% =
24. 24.110 increased by 10% =
25. 25.80 decreased by 5% =
26. 26.780 decreased by 40% =
27. 27.260 decreased by 15% =
28. 28.400 decreased by 10% =
29. 29.130 increased by 40% =
30. 30.800 decreased by 30% =
31. 31.460 increased by 15% =
32. 32.50 increased by 8% =
33. 33.80 increased by 10% =
34. 34.630 decreased by 40% =
35. 35.630 increased by 30% =
36. 36.125 decreased by 12% =
37. 37.434 increased by 50% =
38. 38.725 increased by 20% =
39. 39.580 increased by 35% =
40. 40.620 increased by 10% =

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