Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 138 · 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. 1.45 decreased by 40% =
2. 2.375 increased by 8% =
3. 3.116 decreased by 75% =
4. 4.140 increased by 10% =
5. 5.350 increased by 50% =
6. 6.300 increased by 15% =
7. 7.120 increased by 5% =
8. 8.460 decreased by 35% =
9. 9.190 increased by 20% =
10. 10.460 increased by 5% =
11. 11.320 decreased by 15% =
12. 12.345 decreased by 60% =
13. 13.175 decreased by 20% =
14. 14.308 increased by 75% =
15. 15.280 increased by 15% =
16. 16.565 decreased by 40% =
17. 17.220 increased by 15% =
18. 18.100 decreased by 5% =
19. 19.760 increased by 20% =
20. 20.175 decreased by 8% =
21. 21.150 increased by 60% =
22. 22.445 increased by 40% =
23. 23.80 increased by 30% =
24. 24.460 increased by 50% =
25. 25.75 increased by 8% =
26. 26.200 decreased by 15% =
27. 27.645 increased by 60% =
28. 28.40 increased by 30% =
29. 29.320 increased by 10% =
30. 30.500 decreased by 12% =
31. 31.415 decreased by 60% =
32. 32.360 decreased by 25% =
33. 33.740 decreased by 40% =
34. 34.55 increased by 20% =
35. 35.695 decreased by 40% =
36. 36.716 increased by 75% =
37. 37.780 increased by 15% =
38. 38.120 increased by 15% =
39. 39.690 decreased by 40% =
40. 40.140 increased by 5% =

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