Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 125 · 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. 1.320 decreased by 10% =
2. 2.555 decreased by 40% =
3. 3.200 increased by 5% =
4. 4.640 increased by 15% =
5. 5.684 decreased by 75% =
6. 6.710 increased by 10% =
7. 7.270 decreased by 20% =
8. 8.400 decreased by 10% =
9. 9.160 increased by 5% =
10. 10.600 decreased by 8% =
11. 11.700 increased by 10% =
12. 12.680 decreased by 30% =
13. 13.240 decreased by 5% =
14. 14.640 decreased by 5% =
15. 15.45 decreased by 20% =
16. 16.400 increased by 15% =
17. 17.560 decreased by 15% =
18. 18.344 increased by 25% =
19. 19.515 decreased by 60% =
20. 20.210 decreased by 40% =
21. 21.60 increased by 35% =
22. 22.680 increased by 5% =
23. 23.140 increased by 20% =
24. 24.216 decreased by 50% =
25. 25.110 decreased by 30% =
26. 26.160 increased by 5% =
27. 27.700 increased by 5% =
28. 28.50 decreased by 10% =
29. 29.670 decreased by 10% =
30. 30.745 increased by 20% =
31. 31.350 increased by 20% =
32. 32.770 increased by 30% =
33. 33.410 increased by 40% =
34. 34.92 increased by 75% =
35. 35.250 increased by 8% =
36. 36.800 decreased by 15% =
37. 37.186 increased by 50% =
38. 38.366 increased by 50% =
39. 39.300 decreased by 25% =
40. 40.120 decreased by 60% =

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