Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 344 · 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. 1.260 decreased by 5% =
2. 2.104 decreased by 75% =
3. 3.200 decreased by 30% =
4. 4.270 decreased by 10% =
5. 5.662 increased by 50% =
6. 6.126 decreased by 50% =
7. 7.120 decreased by 60% =
8. 8.480 decreased by 35% =
9. 9.215 decreased by 60% =
10. 10.625 increased by 8% =
11. 11.145 increased by 20% =
12. 12.600 increased by 35% =
13. 13.316 increased by 50% =
14. 14.548 decreased by 75% =
15. 15.290 increased by 30% =
16. 16.555 decreased by 20% =
17. 17.660 decreased by 10% =
18. 18.516 decreased by 50% =
19. 19.465 decreased by 60% =
20. 20.720 increased by 35% =
21. 21.60 increased by 5% =
22. 22.800 decreased by 8% =
23. 23.502 decreased by 50% =
24. 24.308 decreased by 50% =
25. 25.335 decreased by 20% =
26. 26.580 increased by 35% =
27. 27.290 increased by 50% =
28. 28.116 decreased by 25% =
29. 29.288 increased by 25% =
30. 30.110 increased by 10% =
31. 31.385 increased by 20% =
32. 32.450 increased by 12% =
33. 33.450 increased by 12% =
34. 34.600 decreased by 35% =
35. 35.415 decreased by 60% =
36. 36.360 increased by 15% =
37. 37.400 decreased by 5% =
38. 38.532 increased by 75% =
39. 39.700 decreased by 8% =
40. 40.215 decreased by 20% =

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