Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 908 · 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. 1.50 increased by 12% =
2. 2.780 decreased by 10% =
3. 3.775 increased by 40% =
4. 4.320 increased by 60% =
5. 5.120 decreased by 40% =
6. 6.310 increased by 10% =
7. 7.200 decreased by 15% =
8. 8.140 increased by 5% =
9. 9.655 decreased by 40% =
10. 10.520 decreased by 30% =
11. 11.180 increased by 5% =
12. 12.242 increased by 50% =
13. 13.420 decreased by 5% =
14. 14.555 increased by 60% =
15. 15.250 decreased by 30% =
16. 16.94 decreased by 50% =
17. 17.300 decreased by 35% =
18. 18.160 increased by 10% =
19. 19.740 increased by 40% =
20. 20.240 decreased by 35% =
21. 21.780 decreased by 5% =
22. 22.460 increased by 5% =
23. 23.700 increased by 8% =
24. 24.376 increased by 50% =
25. 25.160 decreased by 15% =
26. 26.750 increased by 8% =
27. 27.410 decreased by 30% =
28. 28.665 increased by 20% =
29. 29.600 decreased by 35% =
30. 30.640 decreased by 20% =
31. 31.225 decreased by 60% =
32. 32.200 increased by 10% =
33. 33.230 increased by 10% =
34. 34.300 decreased by 15% =
35. 35.740 increased by 15% =
36. 36.300 decreased by 75% =
37. 37.720 decreased by 5% =
38. 38.285 decreased by 20% =
39. 39.792 decreased by 50% =
40. 40.280 increased by 35% =

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