Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 387 · 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. 1.710 increased by 10% =
2. 2.180 increased by 10% =
3. 3.800 decreased by 30% =
4. 4.400 increased by 15% =
5. 5.100 decreased by 5% =
6. 6.624 increased by 75% =
7. 7.235 decreased by 40% =
8. 8.650 decreased by 10% =
9. 9.320 decreased by 10% =
10. 10.276 decreased by 75% =
11. 11.70 increased by 60% =
12. 12.220 decreased by 15% =
13. 13.90 increased by 30% =
14. 14.180 increased by 5% =
15. 15.80 increased by 5% =
16. 16.204 decreased by 75% =
17. 17.680 decreased by 35% =
18. 18.430 decreased by 40% =
19. 19.500 decreased by 35% =
20. 20.200 decreased by 15% =
21. 21.350 increased by 12% =
22. 22.585 decreased by 20% =
23. 23.760 increased by 35% =
24. 24.470 decreased by 10% =
25. 25.600 increased by 12% =
26. 26.390 decreased by 40% =
27. 27.380 increased by 60% =
28. 28.764 increased by 75% =
29. 29.280 increased by 5% =
30. 30.500 decreased by 15% =
31. 31.300 decreased by 12% =
32. 32.755 increased by 20% =
33. 33.464 decreased by 25% =
34. 34.326 increased by 50% =
35. 35.700 decreased by 30% =
36. 36.145 decreased by 20% =
37. 37.365 increased by 20% =
38. 38.335 increased by 60% =
39. 39.700 increased by 30% =
40. 40.450 increased by 8% =

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