Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 189 · 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. 1.795 decreased by 20% =
2. 2.672 decreased by 75% =
3. 3.740 decreased by 15% =
4. 4.600 decreased by 35% =
5. 5.800 increased by 75% =
6. 6.775 increased by 8% =
7. 7.110 decreased by 50% =
8. 8.652 increased by 75% =
9. 9.580 increased by 5% =
10. 10.650 decreased by 8% =
11. 11.230 decreased by 10% =
12. 12.250 increased by 12% =
13. 13.475 increased by 12% =
14. 14.740 increased by 5% =
15. 15.268 decreased by 50% =
16. 16.385 increased by 60% =
17. 17.560 decreased by 10% =
18. 18.600 decreased by 40% =
19. 19.775 increased by 12% =
20. 20.80 increased by 10% =
21. 21.405 increased by 40% =
22. 22.220 decreased by 5% =
23. 23.550 increased by 12% =
24. 24.175 decreased by 12% =
25. 25.640 increased by 35% =
26. 26.200 decreased by 35% =
27. 27.525 decreased by 8% =
28. 28.675 decreased by 20% =
29. 29.790 decreased by 60% =
30. 30.520 increased by 15% =
31. 31.560 increased by 5% =
32. 32.248 increased by 25% =
33. 33.520 decreased by 35% =
34. 34.376 increased by 75% =
35. 35.740 decreased by 20% =
36. 36.155 decreased by 20% =
37. 37.140 decreased by 35% =
38. 38.336 decreased by 75% =
39. 39.400 decreased by 8% =
40. 40.340 increased by 30% =

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