Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 722 · 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. 1.800 increased by 15% =
2. 2.450 decreased by 10% =
3. 3.140 decreased by 15% =
4. 4.490 decreased by 10% =
5. 5.344 increased by 25% =
6. 6.80 increased by 5% =
7. 7.92 decreased by 25% =
8. 8.650 decreased by 12% =
9. 9.225 decreased by 8% =
10. 10.140 decreased by 10% =
11. 11.500 decreased by 40% =
12. 12.534 decreased by 50% =
13. 13.560 increased by 30% =
14. 14.190 decreased by 20% =
15. 15.144 increased by 25% =
16. 16.540 increased by 15% =
17. 17.580 decreased by 35% =
18. 18.692 increased by 25% =
19. 19.660 decreased by 35% =
20. 20.350 increased by 12% =
21. 21.485 decreased by 40% =
22. 22.370 decreased by 20% =
23. 23.480 decreased by 5% =
24. 24.575 decreased by 12% =
25. 25.500 increased by 30% =
26. 26.400 increased by 10% =
27. 27.580 increased by 50% =
28. 28.800 decreased by 12% =
29. 29.160 increased by 20% =
30. 30.768 increased by 50% =
31. 31.375 decreased by 8% =
32. 32.668 decreased by 50% =
33. 33.100 increased by 8% =
34. 34.170 increased by 10% =
35. 35.745 decreased by 40% =
36. 36.540 increased by 15% =
37. 37.220 increased by 15% =
38. 38.395 decreased by 60% =
39. 39.525 increased by 8% =
40. 40.552 increased by 50% =

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