Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 918 · 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. 1.580 increased by 50% =
2. 2.300 increased by 12% =
3. 3.400 increased by 35% =
4. 4.572 increased by 25% =
5. 5.660 decreased by 35% =
6. 6.85 increased by 60% =
7. 7.775 increased by 20% =
8. 8.760 decreased by 35% =
9. 9.80 increased by 15% =
10. 10.70 increased by 40% =
11. 11.140 increased by 10% =
12. 12.775 increased by 12% =
13. 13.496 decreased by 75% =
14. 14.250 increased by 10% =
15. 15.200 increased by 60% =
16. 16.80 increased by 40% =
17. 17.652 decreased by 75% =
18. 18.200 increased by 10% =
19. 19.675 increased by 8% =
20. 20.672 increased by 25% =
21. 21.445 increased by 20% =
22. 22.750 increased by 8% =
23. 23.600 decreased by 12% =
24. 24.440 increased by 5% =
25. 25.50 increased by 10% =
26. 26.610 decreased by 40% =
27. 27.452 decreased by 25% =
28. 28.315 increased by 40% =
29. 29.590 increased by 10% =
30. 30.85 decreased by 60% =
31. 31.80 increased by 5% =
32. 32.180 increased by 35% =
33. 33.296 decreased by 25% =
34. 34.340 decreased by 35% =
35. 35.500 increased by 30% =
36. 36.300 increased by 8% =
37. 37.800 increased by 15% =
38. 38.430 decreased by 10% =
39. 39.385 increased by 20% =
40. 40.708 decreased by 75% =

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