Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 535 · 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. 1.780 increased by 15% =
2. 2.460 decreased by 60% =
3. 3.540 increased by 35% =
4. 4.360 increased by 15% =
5. 5.776 increased by 75% =
6. 6.780 decreased by 5% =
7. 7.584 increased by 25% =
8. 8.150 decreased by 50% =
9. 9.728 increased by 50% =
10. 10.168 increased by 50% =
11. 11.350 decreased by 12% =
12. 12.360 increased by 35% =
13. 13.150 decreased by 12% =
14. 14.472 increased by 50% =
15. 15.280 increased by 50% =
16. 16.216 increased by 25% =
17. 17.448 increased by 75% =
18. 18.600 increased by 8% =
19. 19.220 decreased by 15% =
20. 20.540 increased by 60% =
21. 21.248 increased by 50% =
22. 22.60 increased by 30% =
23. 23.350 increased by 12% =
24. 24.200 decreased by 15% =
25. 25.52 increased by 50% =
26. 26.180 increased by 5% =
27. 27.780 decreased by 15% =
28. 28.360 decreased by 40% =
29. 29.456 increased by 75% =
30. 30.708 decreased by 25% =
31. 31.75 increased by 8% =
32. 32.340 increased by 15% =
33. 33.705 increased by 60% =
34. 34.325 increased by 8% =
35. 35.450 increased by 8% =
36. 36.605 decreased by 20% =
37. 37.320 decreased by 25% =
38. 38.164 decreased by 75% =
39. 39.768 increased by 25% =
40. 40.715 increased by 20% =

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