Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 117 · 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. 1.52 decreased by 25% =
2. 2.560 increased by 75% =
3. 3.168 increased by 50% =
4. 4.280 decreased by 35% =
5. 5.540 decreased by 35% =
6. 6.205 increased by 60% =
7. 7.250 decreased by 12% =
8. 8.210 increased by 10% =
9. 9.75 increased by 60% =
10. 10.650 increased by 30% =
11. 11.672 increased by 50% =
12. 12.250 decreased by 10% =
13. 13.520 increased by 10% =
14. 14.550 decreased by 30% =
15. 15.775 increased by 8% =
16. 16.120 increased by 30% =
17. 17.70 decreased by 20% =
18. 18.560 increased by 60% =
19. 19.370 decreased by 20% =
20. 20.45 increased by 60% =
21. 21.230 decreased by 10% =
22. 22.425 decreased by 40% =
23. 23.496 increased by 75% =
24. 24.650 increased by 20% =
25. 25.360 increased by 10% =
26. 26.60 decreased by 35% =
27. 27.780 increased by 5% =
28. 28.655 decreased by 20% =
29. 29.790 decreased by 30% =
30. 30.716 decreased by 25% =
31. 31.310 decreased by 10% =
32. 32.510 increased by 20% =
33. 33.320 increased by 50% =
34. 34.380 decreased by 15% =
35. 35.725 increased by 40% =
36. 36.115 increased by 20% =
37. 37.400 increased by 75% =
38. 38.80 increased by 25% =
39. 39.636 decreased by 25% =
40. 40.225 increased by 40% =

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