Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 411 · 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. 1.385 decreased by 60% =
2. 2.125 decreased by 8% =
3. 3.415 increased by 40% =
4. 4.626 increased by 50% =
5. 5.160 increased by 15% =
6. 6.760 decreased by 5% =
7. 7.375 decreased by 8% =
8. 8.380 increased by 15% =
9. 9.112 increased by 75% =
10. 10.600 decreased by 5% =
11. 11.75 increased by 8% =
12. 12.600 increased by 12% =
13. 13.400 increased by 15% =
14. 14.540 decreased by 25% =
15. 15.144 decreased by 25% =
16. 16.780 increased by 20% =
17. 17.524 decreased by 25% =
18. 18.650 increased by 12% =
19. 19.625 decreased by 40% =
20. 20.155 increased by 40% =
21. 21.790 increased by 40% =
22. 22.225 increased by 8% =
23. 23.120 decreased by 5% =
24. 24.124 decreased by 75% =
25. 25.612 increased by 25% =
26. 26.700 decreased by 12% =
27. 27.480 decreased by 5% =
28. 28.615 increased by 40% =
29. 29.795 increased by 60% =
30. 30.700 decreased by 60% =
31. 31.645 increased by 40% =
32. 32.215 increased by 40% =
33. 33.125 increased by 8% =
34. 34.180 decreased by 10% =
35. 35.370 increased by 30% =
36. 36.488 increased by 25% =
37. 37.100 increased by 15% =
38. 38.608 increased by 25% =
39. 39.560 decreased by 35% =
40. 40.70 decreased by 10% =

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