Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 502 · 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. 1.55 increased by 20% =
2. 2.214 increased by 50% =
3. 3.460 decreased by 60% =
4. 4.300 decreased by 40% =
5. 5.550 increased by 8% =
6. 6.320 increased by 15% =
7. 7.610 decreased by 10% =
8. 8.200 increased by 5% =
9. 9.220 increased by 5% =
10. 10.580 decreased by 5% =
11. 11.760 increased by 15% =
12. 12.175 decreased by 8% =
13. 13.760 decreased by 10% =
14. 14.180 increased by 15% =
15. 15.650 increased by 12% =
16. 16.175 decreased by 12% =
17. 17.696 decreased by 50% =
18. 18.380 increased by 60% =
19. 19.700 decreased by 15% =
20. 20.780 increased by 25% =
21. 21.772 decreased by 75% =
22. 22.96 increased by 50% =
23. 23.340 increased by 20% =
24. 24.680 increased by 20% =
25. 25.225 increased by 12% =
26. 26.240 decreased by 5% =
27. 27.110 increased by 10% =
28. 28.600 decreased by 35% =
29. 29.280 decreased by 60% =
30. 30.600 increased by 8% =
31. 31.180 increased by 35% =
32. 32.750 decreased by 30% =
33. 33.130 decreased by 30% =
34. 34.672 decreased by 75% =
35. 35.760 decreased by 35% =
36. 36.420 increased by 15% =
37. 37.164 decreased by 25% =
38. 38.610 increased by 30% =
39. 39.400 decreased by 5% =
40. 40.780 increased by 15% =

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