Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 407 · 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. 1.165 increased by 60% =
2. 2.780 increased by 5% =
3. 3.80 decreased by 15% =
4. 4.160 decreased by 15% =
5. 5.725 increased by 8% =
6. 6.40 increased by 15% =
7. 7.676 increased by 25% =
8. 8.134 increased by 50% =
9. 9.300 increased by 35% =
10. 10.250 decreased by 12% =
11. 11.584 increased by 75% =
12. 12.800 decreased by 5% =
13. 13.100 increased by 30% =
14. 14.696 increased by 75% =
15. 15.420 increased by 15% =
16. 16.40 decreased by 30% =
17. 17.444 decreased by 75% =
18. 18.300 increased by 8% =
19. 19.290 decreased by 20% =
20. 20.330 increased by 10% =
21. 21.300 decreased by 5% =
22. 22.190 decreased by 40% =
23. 23.680 increased by 35% =
24. 24.740 decreased by 40% =
25. 25.100 decreased by 30% =
26. 26.740 increased by 30% =
27. 27.165 increased by 20% =
28. 28.750 increased by 20% =
29. 29.85 increased by 60% =
30. 30.505 increased by 40% =
31. 31.190 increased by 20% =
32. 32.550 increased by 60% =
33. 33.725 increased by 12% =
34. 34.652 increased by 25% =
35. 35.710 increased by 30% =
36. 36.80 increased by 30% =
37. 37.300 increased by 8% =
38. 38.545 increased by 20% =
39. 39.440 increased by 75% =
40. 40.646 decreased by 50% =

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