Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 707 · 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. 1.780 decreased by 5% =
2. 2.786 increased by 50% =
3. 3.680 increased by 20% =
4. 4.775 decreased by 8% =
5. 5.780 increased by 10% =
6. 6.248 increased by 25% =
7. 7.778 decreased by 50% =
8. 8.540 increased by 15% =
9. 9.50 increased by 20% =
10. 10.336 increased by 75% =
11. 11.615 decreased by 40% =
12. 12.760 decreased by 15% =
13. 13.160 decreased by 5% =
14. 14.540 decreased by 35% =
15. 15.430 increased by 40% =
16. 16.80 decreased by 30% =
17. 17.415 increased by 40% =
18. 18.320 increased by 15% =
19. 19.60 decreased by 5% =
20. 20.540 increased by 5% =
21. 21.50 increased by 12% =
22. 22.105 increased by 40% =
23. 23.480 increased by 30% =
24. 24.184 increased by 25% =
25. 25.320 decreased by 15% =
26. 26.625 increased by 12% =
27. 27.530 increased by 30% =
28. 28.140 decreased by 5% =
29. 29.770 decreased by 30% =
30. 30.275 decreased by 8% =
31. 31.40 increased by 15% =
32. 32.660 increased by 10% =
33. 33.160 increased by 15% =
34. 34.740 decreased by 10% =
35. 35.428 increased by 50% =
36. 36.160 decreased by 5% =
37. 37.655 increased by 60% =
38. 38.650 increased by 8% =
39. 39.240 decreased by 15% =
40. 40.800 decreased by 5% =

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