Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 775 · 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. 1.80 increased by 35% =
2. 2.592 decreased by 75% =
3. 3.160 decreased by 15% =
4. 4.45 decreased by 60% =
5. 5.240 decreased by 75% =
6. 6.80 increased by 30% =
7. 7.336 decreased by 25% =
8. 8.300 decreased by 8% =
9. 9.625 decreased by 12% =
10. 10.440 increased by 60% =
11. 11.660 increased by 30% =
12. 12.400 increased by 12% =
13. 13.244 decreased by 75% =
14. 14.340 decreased by 5% =
15. 15.420 increased by 15% =
16. 16.450 decreased by 8% =
17. 17.668 decreased by 25% =
18. 18.640 decreased by 25% =
19. 19.350 decreased by 8% =
20. 20.640 decreased by 5% =
21. 21.420 increased by 50% =
22. 22.760 increased by 15% =
23. 23.332 increased by 25% =
24. 24.500 decreased by 5% =
25. 25.380 increased by 60% =
26. 26.500 decreased by 8% =
27. 27.600 decreased by 12% =
28. 28.40 increased by 5% =
29. 29.708 increased by 25% =
30. 30.120 decreased by 5% =
31. 31.492 increased by 75% =
32. 32.575 decreased by 40% =
33. 33.75 decreased by 8% =
34. 34.244 decreased by 75% =
35. 35.412 increased by 50% =
36. 36.625 decreased by 60% =
37. 37.700 decreased by 30% =
38. 38.95 increased by 60% =
39. 39.552 decreased by 50% =
40. 40.58 increased by 50% =

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