Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 449 · 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. 1.650 decreased by 50% =
2. 2.684 decreased by 25% =
3. 3.130 increased by 10% =
4. 4.100 decreased by 8% =
5. 5.510 increased by 30% =
6. 6.88 increased by 75% =
7. 7.725 decreased by 12% =
8. 8.648 decreased by 50% =
9. 9.110 decreased by 20% =
10. 10.780 decreased by 15% =
11. 11.160 decreased by 35% =
12. 12.335 increased by 20% =
13. 13.150 decreased by 12% =
14. 14.560 decreased by 10% =
15. 15.420 increased by 60% =
16. 16.750 decreased by 8% =
17. 17.648 increased by 25% =
18. 18.260 increased by 30% =
19. 19.300 increased by 15% =
20. 20.252 increased by 50% =
21. 21.790 increased by 60% =
22. 22.420 decreased by 5% =
23. 23.98 increased by 50% =
24. 24.760 decreased by 15% =
25. 25.75 increased by 12% =
26. 26.740 decreased by 50% =
27. 27.80 increased by 35% =
28. 28.220 increased by 35% =
29. 29.158 increased by 50% =
30. 30.362 increased by 50% =
31. 31.270 decreased by 20% =
32. 32.220 increased by 30% =
33. 33.448 increased by 25% =
34. 34.515 decreased by 60% =
35. 35.550 increased by 12% =
36. 36.295 decreased by 60% =
37. 37.480 decreased by 60% =
38. 38.260 increased by 10% =
39. 39.736 increased by 25% =
40. 40.55 decreased by 40% =

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