Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 835 · 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. 1.520 decreased by 20% =
2. 2.220 increased by 35% =
3. 3.75 decreased by 20% =
4. 4.240 increased by 5% =
5. 5.700 decreased by 30% =
6. 6.130 increased by 20% =
7. 7.240 decreased by 30% =
8. 8.470 decreased by 30% =
9. 9.725 increased by 12% =
10. 10.542 increased by 50% =
11. 11.716 decreased by 25% =
12. 12.188 increased by 75% =
13. 13.260 decreased by 10% =
14. 14.684 increased by 50% =
15. 15.280 increased by 40% =
16. 16.760 increased by 15% =
17. 17.180 increased by 10% =
18. 18.100 increased by 30% =
19. 19.620 increased by 15% =
20. 20.632 increased by 75% =
21. 21.85 increased by 20% =
22. 22.500 decreased by 5% =
23. 23.760 decreased by 5% =
24. 24.745 increased by 60% =
25. 25.660 decreased by 5% =
26. 26.440 decreased by 20% =
27. 27.695 increased by 60% =
28. 28.160 decreased by 15% =
29. 29.600 decreased by 8% =
30. 30.770 decreased by 30% =
31. 31.300 increased by 10% =
32. 32.175 decreased by 8% =
33. 33.425 increased by 60% =
34. 34.705 decreased by 40% =
35. 35.384 increased by 50% =
36. 36.146 increased by 50% =
37. 37.575 increased by 20% =
38. 38.196 decreased by 75% =
39. 39.360 increased by 5% =
40. 40.100 decreased by 75% =

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