Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 751 · 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. 1.275 decreased by 8% =
2. 2.375 increased by 12% =
3. 3.84 decreased by 75% =
4. 4.360 decreased by 15% =
5. 5.352 increased by 75% =
6. 6.300 increased by 20% =
7. 7.50 increased by 10% =
8. 8.80 increased by 5% =
9. 9.420 increased by 35% =
10. 10.360 increased by 15% =
11. 11.720 decreased by 35% =
12. 12.60 increased by 5% =
13. 13.575 increased by 8% =
14. 14.505 increased by 20% =
15. 15.60 decreased by 20% =
16. 16.280 increased by 15% =
17. 17.796 decreased by 25% =
18. 18.660 increased by 20% =
19. 19.455 increased by 40% =
20. 20.750 increased by 30% =
21. 21.160 decreased by 10% =
22. 22.740 decreased by 15% =
23. 23.500 increased by 30% =
24. 24.600 increased by 5% =
25. 25.350 decreased by 40% =
26. 26.300 increased by 5% =
27. 27.236 increased by 25% =
28. 28.575 decreased by 8% =
29. 29.640 increased by 35% =
30. 30.560 increased by 5% =
31. 31.800 increased by 15% =
32. 32.225 increased by 12% =
33. 33.630 decreased by 10% =
34. 34.750 increased by 12% =
35. 35.520 decreased by 5% =
36. 36.300 decreased by 40% =
37. 37.525 decreased by 60% =
38. 38.560 increased by 5% =
39. 39.300 decreased by 30% =
40. 40.420 increased by 25% =

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