Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 821 · 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. 1.600 decreased by 35% =
2. 2.135 decreased by 20% =
3. 3.52 decreased by 75% =
4. 4.584 decreased by 25% =
5. 5.700 increased by 40% =
6. 6.240 decreased by 15% =
7. 7.380 increased by 5% =
8. 8.500 increased by 30% =
9. 9.90 increased by 20% =
10. 10.340 decreased by 5% =
11. 11.800 increased by 8% =
12. 12.720 increased by 15% =
13. 13.625 increased by 12% =
14. 14.375 increased by 8% =
15. 15.500 decreased by 12% =
16. 16.280 increased by 60% =
17. 17.230 decreased by 50% =
18. 18.600 decreased by 12% =
19. 19.460 increased by 20% =
20. 20.280 decreased by 10% =
21. 21.350 decreased by 30% =
22. 22.560 decreased by 35% =
23. 23.755 decreased by 60% =
24. 24.420 increased by 15% =
25. 25.440 increased by 15% =
26. 26.80 decreased by 50% =
27. 27.500 decreased by 15% =
28. 28.590 decreased by 20% =
29. 29.220 increased by 10% =
30. 30.516 increased by 75% =
31. 31.700 decreased by 10% =
32. 32.790 decreased by 60% =
33. 33.496 increased by 75% =
34. 34.380 decreased by 35% =
35. 35.40 increased by 15% =
36. 36.312 increased by 50% =
37. 37.175 increased by 60% =
38. 38.344 increased by 75% =
39. 39.225 decreased by 12% =
40. 40.700 increased by 5% =

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