Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 165 · 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. 1.110 decreased by 20% =
2. 2.40 decreased by 35% =
3. 3.735 increased by 60% =
4. 4.135 increased by 40% =
5. 5.480 decreased by 35% =
6. 6.240 increased by 15% =
7. 7.70 increased by 20% =
8. 8.720 increased by 5% =
9. 9.524 decreased by 50% =
10. 10.640 decreased by 15% =
11. 11.68 increased by 25% =
12. 12.700 decreased by 5% =
13. 13.712 increased by 25% =
14. 14.705 decreased by 60% =
15. 15.730 increased by 30% =
16. 16.485 decreased by 60% =
17. 17.550 decreased by 50% =
18. 18.630 decreased by 10% =
19. 19.75 decreased by 8% =
20. 20.65 decreased by 20% =
21. 21.116 increased by 50% =
22. 22.480 increased by 15% =
23. 23.640 decreased by 5% =
24. 24.240 increased by 75% =
25. 25.245 increased by 20% =
26. 26.270 decreased by 20% =
27. 27.380 increased by 40% =
28. 28.685 decreased by 60% =
29. 29.80 increased by 5% =
30. 30.560 decreased by 35% =
31. 31.300 decreased by 15% =
32. 32.780 increased by 35% =
33. 33.548 decreased by 50% =
34. 34.140 increased by 15% =
35. 35.275 increased by 8% =
36. 36.100 increased by 12% =
37. 37.58 increased by 50% =
38. 38.530 decreased by 60% =
39. 39.40 decreased by 40% =
40. 40.335 decreased by 40% =

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