Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 770 · 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. 1.40 increased by 25% =
2. 2.300 increased by 60% =
3. 3.140 decreased by 50% =
4. 4.220 decreased by 25% =
5. 5.360 increased by 5% =
6. 6.585 decreased by 40% =
7. 7.745 increased by 20% =
8. 8.175 decreased by 8% =
9. 9.780 decreased by 5% =
10. 10.510 decreased by 10% =
11. 11.580 decreased by 35% =
12. 12.310 decreased by 40% =
13. 13.578 increased by 50% =
14. 14.760 increased by 75% =
15. 15.90 increased by 60% =
16. 16.500 increased by 60% =
17. 17.220 decreased by 15% =
18. 18.134 decreased by 50% =
19. 19.680 decreased by 35% =
20. 20.40 increased by 25% =
21. 21.315 decreased by 40% =
22. 22.625 increased by 8% =
23. 23.275 increased by 8% =
24. 24.125 decreased by 8% =
25. 25.280 decreased by 75% =
26. 26.200 decreased by 8% =
27. 27.584 increased by 75% =
28. 28.225 increased by 60% =
29. 29.380 increased by 25% =
30. 30.470 increased by 60% =
31. 31.525 increased by 12% =
32. 32.50 increased by 8% =
33. 33.180 decreased by 75% =
34. 34.225 decreased by 8% =
35. 35.700 increased by 15% =
36. 36.180 decreased by 30% =
37. 37.80 decreased by 35% =
38. 38.600 decreased by 8% =
39. 39.220 decreased by 75% =
40. 40.432 increased by 25% =

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