Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 731 · 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. 1.545 increased by 20% =
2. 2.780 increased by 15% =
3. 3.540 decreased by 5% =
4. 4.285 increased by 60% =
5. 5.320 decreased by 10% =
6. 6.760 increased by 5% =
7. 7.775 decreased by 60% =
8. 8.740 increased by 50% =
9. 9.240 increased by 5% =
10. 10.744 increased by 75% =
11. 11.40 increased by 35% =
12. 12.300 increased by 15% =
13. 13.420 decreased by 15% =
14. 14.480 decreased by 15% =
15. 15.180 increased by 5% =
16. 16.345 increased by 20% =
17. 17.740 increased by 15% =
18. 18.76 decreased by 75% =
19. 19.280 increased by 5% =
20. 20.480 increased by 5% =
21. 21.460 decreased by 15% =
22. 22.100 decreased by 40% =
23. 23.125 increased by 8% =
24. 24.75 decreased by 40% =
25. 25.100 increased by 5% =
26. 26.40 increased by 5% =
27. 27.726 decreased by 50% =
28. 28.60 increased by 15% =
29. 29.200 decreased by 10% =
30. 30.700 decreased by 10% =
31. 31.224 decreased by 75% =
32. 32.365 increased by 60% =
33. 33.780 increased by 30% =
34. 34.705 increased by 60% =
35. 35.632 decreased by 75% =
36. 36.780 increased by 5% =
37. 37.260 increased by 15% =
38. 38.420 increased by 5% =
39. 39.600 decreased by 15% =
40. 40.200 decreased by 35% =

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