Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 803 · 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. 1.144 decreased by 25% =
2. 2.760 decreased by 25% =
3. 3.600 increased by 12% =
4. 4.164 decreased by 75% =
5. 5.550 decreased by 8% =
6. 6.425 increased by 40% =
7. 7.400 increased by 30% =
8. 8.170 increased by 10% =
9. 9.180 decreased by 5% =
10. 10.60 decreased by 30% =
11. 11.350 increased by 10% =
12. 12.220 increased by 50% =
13. 13.96 increased by 25% =
14. 14.588 increased by 75% =
15. 15.580 decreased by 40% =
16. 16.80 decreased by 25% =
17. 17.675 decreased by 12% =
18. 18.640 increased by 5% =
19. 19.160 increased by 30% =
20. 20.100 decreased by 35% =
21. 21.688 decreased by 25% =
22. 22.380 increased by 35% =
23. 23.260 decreased by 40% =
24. 24.350 increased by 8% =
25. 25.560 increased by 40% =
26. 26.580 decreased by 15% =
27. 27.600 increased by 40% =
28. 28.616 increased by 25% =
29. 29.150 increased by 10% =
30. 30.380 decreased by 15% =
31. 31.525 decreased by 12% =
32. 32.40 increased by 35% =
33. 33.400 increased by 15% =
34. 34.300 increased by 8% =
35. 35.440 decreased by 10% =
36. 36.425 increased by 20% =
37. 37.300 increased by 5% =
38. 38.200 decreased by 8% =
39. 39.220 decreased by 35% =
40. 40.40 decreased by 15% =

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