Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 629 · 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. 1.664 decreased by 25% =
2. 2.295 decreased by 40% =
3. 3.580 increased by 35% =
4. 4.500 increased by 15% =
5. 5.450 decreased by 10% =
6. 6.320 decreased by 35% =
7. 7.175 decreased by 8% =
8. 8.760 increased by 25% =
9. 9.570 increased by 40% =
10. 10.580 decreased by 35% =
11. 11.170 increased by 30% =
12. 12.100 increased by 8% =
13. 13.800 increased by 8% =
14. 14.275 increased by 20% =
15. 15.132 increased by 25% =
16. 16.580 increased by 5% =
17. 17.464 increased by 75% =
18. 18.175 decreased by 8% =
19. 19.375 increased by 8% =
20. 20.624 decreased by 25% =
21. 21.40 increased by 35% =
22. 22.600 decreased by 10% =
23. 23.455 increased by 20% =
24. 24.180 decreased by 10% =
25. 25.400 increased by 12% =
26. 26.700 decreased by 5% =
27. 27.140 increased by 10% =
28. 28.442 decreased by 50% =
29. 29.240 increased by 35% =
30. 30.680 increased by 15% =
31. 31.200 increased by 30% =
32. 32.130 increased by 20% =
33. 33.416 increased by 25% =
34. 34.50 decreased by 12% =
35. 35.220 increased by 35% =
36. 36.600 decreased by 35% =
37. 37.420 increased by 20% =
38. 38.600 decreased by 5% =
39. 39.300 decreased by 50% =
40. 40.700 increased by 5% =

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