Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 27 · 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 8% =
2. 2.695 decreased by 20% =
3. 3.620 increased by 5% =
4. 4.700 increased by 15% =
5. 5.276 decreased by 50% =
6. 6.220 decreased by 35% =
7. 7.525 increased by 8% =
8. 8.300 decreased by 12% =
9. 9.540 decreased by 40% =
10. 10.640 decreased by 15% =
11. 11.340 decreased by 5% =
12. 12.450 increased by 30% =
13. 13.140 decreased by 35% =
14. 14.520 increased by 25% =
15. 15.580 increased by 10% =
16. 16.560 decreased by 15% =
17. 17.560 decreased by 15% =
18. 18.564 decreased by 75% =
19. 19.360 decreased by 50% =
20. 20.780 increased by 15% =
21. 21.628 increased by 75% =
22. 22.450 decreased by 40% =
23. 23.330 increased by 50% =
24. 24.280 increased by 25% =
25. 25.640 decreased by 60% =
26. 26.125 increased by 60% =
27. 27.800 increased by 12% =
28. 28.375 increased by 8% =
29. 29.580 increased by 10% =
30. 30.260 increased by 5% =
31. 31.140 increased by 20% =
32. 32.465 decreased by 40% =
33. 33.75 decreased by 40% =
34. 34.200 increased by 35% =
35. 35.400 decreased by 30% =
36. 36.792 increased by 25% =
37. 37.670 decreased by 40% =
38. 38.430 increased by 10% =
39. 39.80 increased by 15% =
40. 40.760 increased by 40% =

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