Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 673 · 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. 1.210 increased by 60% =
2. 2.435 increased by 20% =
3. 3.180 decreased by 10% =
4. 4.280 increased by 35% =
5. 5.580 decreased by 10% =
6. 6.704 decreased by 75% =
7. 7.228 decreased by 25% =
8. 8.60 increased by 5% =
9. 9.220 increased by 5% =
10. 10.360 increased by 15% =
11. 11.40 decreased by 5% =
12. 12.272 decreased by 25% =
13. 13.300 decreased by 15% =
14. 14.200 decreased by 8% =
15. 15.695 increased by 20% =
16. 16.800 decreased by 12% =
17. 17.100 decreased by 50% =
18. 18.230 increased by 10% =
19. 19.480 decreased by 10% =
20. 20.220 increased by 35% =
21. 21.792 decreased by 25% =
22. 22.75 decreased by 12% =
23. 23.360 increased by 15% =
24. 24.300 increased by 40% =
25. 25.354 increased by 50% =
26. 26.150 increased by 12% =
27. 27.90 increased by 10% =
28. 28.130 decreased by 10% =
29. 29.632 increased by 75% =
30. 30.290 increased by 30% =
31. 31.200 decreased by 15% =
32. 32.532 increased by 25% =
33. 33.660 decreased by 35% =
34. 34.760 decreased by 15% =
35. 35.560 decreased by 60% =
36. 36.320 increased by 35% =
37. 37.650 increased by 20% =
38. 38.765 increased by 60% =
39. 39.472 decreased by 75% =
40. 40.500 decreased by 25% =

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