Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 560 · 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. 1.100 decreased by 15% =
2. 2.530 decreased by 50% =
3. 3.50 decreased by 40% =
4. 4.320 decreased by 75% =
5. 5.60 decreased by 35% =
6. 6.464 decreased by 50% =
7. 7.490 decreased by 10% =
8. 8.40 decreased by 35% =
9. 9.475 decreased by 60% =
10. 10.75 decreased by 12% =
11. 11.488 decreased by 25% =
12. 12.650 decreased by 40% =
13. 13.52 decreased by 25% =
14. 14.490 decreased by 40% =
15. 15.385 decreased by 40% =
16. 16.600 decreased by 12% =
17. 17.510 increased by 60% =
18. 18.800 increased by 25% =
19. 19.100 increased by 35% =
20. 20.300 decreased by 35% =
21. 21.170 decreased by 10% =
22. 22.340 increased by 35% =
23. 23.100 decreased by 15% =
24. 24.775 increased by 8% =
25. 25.260 decreased by 35% =
26. 26.710 decreased by 10% =
27. 27.620 decreased by 10% =
28. 28.540 decreased by 5% =
29. 29.140 increased by 35% =
30. 30.600 decreased by 15% =
31. 31.250 increased by 60% =
32. 32.680 increased by 15% =
33. 33.310 increased by 20% =
34. 34.280 decreased by 25% =
35. 35.75 increased by 12% =
36. 36.368 increased by 75% =
37. 37.80 decreased by 15% =
38. 38.300 decreased by 35% =
39. 39.40 increased by 15% =
40. 40.732 increased by 25% =

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