Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 111 · 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. 1.300 decreased by 25% =
2. 2.760 increased by 5% =
3. 3.645 increased by 20% =
4. 4.286 decreased by 50% =
5. 5.420 increased by 15% =
6. 6.50 decreased by 8% =
7. 7.175 decreased by 8% =
8. 8.480 increased by 50% =
9. 9.750 increased by 12% =
10. 10.330 increased by 40% =
11. 11.690 decreased by 30% =
12. 12.170 decreased by 10% =
13. 13.400 decreased by 30% =
14. 14.40 increased by 10% =
15. 15.580 increased by 5% =
16. 16.230 increased by 60% =
17. 17.640 increased by 5% =
18. 18.416 decreased by 50% =
19. 19.440 increased by 35% =
20. 20.40 decreased by 15% =
21. 21.400 increased by 8% =
22. 22.65 increased by 60% =
23. 23.656 increased by 25% =
24. 24.400 decreased by 12% =
25. 25.50 increased by 40% =
26. 26.228 increased by 75% =
27. 27.480 decreased by 15% =
28. 28.100 decreased by 12% =
29. 29.318 increased by 50% =
30. 30.70 decreased by 10% =
31. 31.700 decreased by 12% =
32. 32.390 decreased by 20% =
33. 33.435 decreased by 60% =
34. 34.315 decreased by 60% =
35. 35.644 decreased by 75% =
36. 36.390 decreased by 10% =
37. 37.600 increased by 75% =
38. 38.80 decreased by 75% =
39. 39.400 decreased by 5% =
40. 40.500 increased by 10% =

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