Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 458 · 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. 1.40 decreased by 30% =
2. 2.50 decreased by 12% =
3. 3.528 decreased by 25% =
4. 4.500 increased by 8% =
5. 5.640 decreased by 35% =
6. 6.500 decreased by 12% =
7. 7.84 increased by 75% =
8. 8.600 increased by 12% =
9. 9.700 increased by 20% =
10. 10.440 decreased by 5% =
11. 11.185 increased by 60% =
12. 12.535 decreased by 20% =
13. 13.420 decreased by 30% =
14. 14.80 increased by 15% =
15. 15.65 increased by 40% =
16. 16.400 decreased by 15% =
17. 17.240 increased by 5% =
18. 18.300 increased by 8% =
19. 19.500 decreased by 8% =
20. 20.616 increased by 50% =
21. 21.760 decreased by 20% =
22. 22.616 increased by 50% =
23. 23.538 increased by 50% =
24. 24.350 decreased by 8% =
25. 25.660 increased by 35% =
26. 26.380 decreased by 10% =
27. 27.50 increased by 10% =
28. 28.280 decreased by 35% =
29. 29.250 increased by 10% =
30. 30.325 increased by 8% =
31. 31.675 decreased by 12% =
32. 32.580 decreased by 5% =
33. 33.150 decreased by 20% =
34. 34.740 increased by 20% =
35. 35.686 increased by 50% =
36. 36.710 increased by 60% =
37. 37.50 decreased by 8% =
38. 38.105 increased by 20% =
39. 39.692 decreased by 50% =
40. 40.795 increased by 60% =

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