Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 495 · 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 decreased by 20% =
2. 2.750 increased by 10% =
3. 3.640 decreased by 5% =
4. 4.380 decreased by 35% =
5. 5.464 increased by 25% =
6. 6.600 increased by 30% =
7. 7.200 increased by 30% =
8. 8.332 increased by 50% =
9. 9.410 increased by 20% =
10. 10.480 decreased by 10% =
11. 11.630 decreased by 50% =
12. 12.50 decreased by 10% =
13. 13.632 decreased by 75% =
14. 14.80 increased by 15% =
15. 15.146 decreased by 50% =
16. 16.100 increased by 12% =
17. 17.798 decreased by 50% =
18. 18.216 increased by 75% =
19. 19.88 increased by 25% =
20. 20.200 increased by 35% =
21. 21.80 increased by 5% =
22. 22.180 increased by 35% =
23. 23.56 increased by 25% =
24. 24.236 increased by 50% =
25. 25.85 decreased by 40% =
26. 26.300 decreased by 35% =
27. 27.680 increased by 35% =
28. 28.700 decreased by 8% =
29. 29.70 decreased by 60% =
30. 30.110 decreased by 10% =
31. 31.250 increased by 12% =
32. 32.640 increased by 5% =
33. 33.225 decreased by 12% =
34. 34.732 decreased by 75% =
35. 35.90 increased by 40% =
36. 36.125 increased by 40% =
37. 37.572 decreased by 25% =
38. 38.310 increased by 20% =
39. 39.520 decreased by 5% =
40. 40.785 decreased by 40% =

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