Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 264 · 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. 1.620 increased by 35% =
2. 2.605 decreased by 20% =
3. 3.320 decreased by 5% =
4. 4.570 increased by 60% =
5. 5.330 decreased by 60% =
6. 6.200 decreased by 35% =
7. 7.560 decreased by 50% =
8. 8.750 increased by 8% =
9. 9.130 decreased by 30% =
10. 10.80 decreased by 15% =
11. 11.40 decreased by 10% =
12. 12.248 increased by 50% =
13. 13.300 increased by 15% =
14. 14.280 increased by 40% =
15. 15.524 increased by 50% =
16. 16.660 increased by 20% =
17. 17.292 increased by 50% =
18. 18.160 decreased by 5% =
19. 19.75 increased by 12% =
20. 20.300 increased by 20% =
21. 21.400 increased by 8% =
22. 22.260 decreased by 5% =
23. 23.168 increased by 50% =
24. 24.680 decreased by 15% =
25. 25.520 increased by 10% =
26. 26.108 decreased by 25% =
27. 27.150 increased by 8% =
28. 28.164 decreased by 75% =
29. 29.650 decreased by 10% =
30. 30.40 increased by 5% =
31. 31.590 increased by 10% =
32. 32.756 increased by 75% =
33. 33.260 increased by 35% =
34. 34.540 increased by 20% =
35. 35.175 increased by 12% =
36. 36.272 decreased by 25% =
37. 37.550 decreased by 20% =
38. 38.735 increased by 20% =
39. 39.725 increased by 40% =
40. 40.164 increased by 75% =

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