Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 587 · 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. 1.125 increased by 12% =
2. 2.660 increased by 35% =
3. 3.786 increased by 50% =
4. 4.280 decreased by 15% =
5. 5.760 decreased by 15% =
6. 6.505 increased by 40% =
7. 7.494 decreased by 50% =
8. 8.225 increased by 8% =
9. 9.775 decreased by 12% =
10. 10.430 decreased by 10% =
11. 11.500 increased by 5% =
12. 12.200 increased by 30% =
13. 13.80 increased by 5% =
14. 14.375 increased by 8% =
15. 15.600 decreased by 8% =
16. 16.40 increased by 15% =
17. 17.380 increased by 35% =
18. 18.175 increased by 12% =
19. 19.260 decreased by 20% =
20. 20.560 decreased by 20% =
21. 21.525 increased by 12% =
22. 22.300 increased by 30% =
23. 23.400 decreased by 8% =
24. 24.695 increased by 20% =
25. 25.660 decreased by 5% =
26. 26.240 increased by 5% =
27. 27.700 decreased by 25% =
28. 28.680 increased by 40% =
29. 29.275 decreased by 8% =
30. 30.75 increased by 20% =
31. 31.80 increased by 5% =
32. 32.164 increased by 75% =
33. 33.175 decreased by 12% =
34. 34.720 decreased by 5% =
35. 35.740 decreased by 10% =
36. 36.75 increased by 20% =
37. 37.150 decreased by 8% =
38. 38.70 increased by 10% =
39. 39.120 decreased by 15% =
40. 40.660 increased by 5% =

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