Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 531 · 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. 1.675 decreased by 8% =
2. 2.675 decreased by 12% =
3. 3.500 increased by 15% =
4. 4.440 decreased by 15% =
5. 5.400 increased by 35% =
6. 6.172 decreased by 50% =
7. 7.360 increased by 5% =
8. 8.425 increased by 12% =
9. 9.580 decreased by 15% =
10. 10.640 increased by 15% =
11. 11.680 decreased by 30% =
12. 12.100 decreased by 10% =
13. 13.190 decreased by 30% =
14. 14.550 increased by 10% =
15. 15.200 increased by 5% =
16. 16.680 decreased by 15% =
17. 17.405 decreased by 20% =
18. 18.140 increased by 75% =
19. 19.312 increased by 75% =
20. 20.445 decreased by 20% =
21. 21.304 increased by 75% =
22. 22.596 increased by 75% =
23. 23.376 increased by 25% =
24. 24.580 increased by 5% =
25. 25.240 increased by 60% =
26. 26.795 increased by 60% =
27. 27.460 increased by 35% =
28. 28.740 decreased by 5% =
29. 29.608 increased by 50% =
30. 30.500 increased by 15% =
31. 31.450 increased by 10% =
32. 32.640 decreased by 10% =
33. 33.80 decreased by 10% =
34. 34.225 increased by 40% =
35. 35.360 decreased by 75% =
36. 36.764 decreased by 75% =
37. 37.315 decreased by 20% =
38. 38.480 increased by 15% =
39. 39.542 increased by 50% =
40. 40.228 decreased by 75% =

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