Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 754 · 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. 1.420 decreased by 15% =
2. 2.100 increased by 5% =
3. 3.200 decreased by 12% =
4. 4.660 decreased by 10% =
5. 5.320 increased by 5% =
6. 6.244 decreased by 50% =
7. 7.75 increased by 8% =
8. 8.168 decreased by 75% =
9. 9.480 decreased by 5% =
10. 10.420 decreased by 75% =
11. 11.700 decreased by 8% =
12. 12.360 decreased by 10% =
13. 13.515 increased by 40% =
14. 14.640 increased by 15% =
15. 15.295 decreased by 20% =
16. 16.325 decreased by 40% =
17. 17.800 increased by 5% =
18. 18.180 decreased by 35% =
19. 19.725 increased by 8% =
20. 20.620 increased by 30% =
21. 21.265 decreased by 40% =
22. 22.690 increased by 30% =
23. 23.625 decreased by 20% =
24. 24.430 increased by 20% =
25. 25.140 decreased by 10% =
26. 26.392 decreased by 25% =
27. 27.510 decreased by 30% =
28. 28.525 increased by 12% =
29. 29.668 increased by 25% =
30. 30.522 increased by 50% =
31. 31.425 increased by 20% =
32. 32.660 decreased by 30% =
33. 33.320 increased by 35% =
34. 34.565 decreased by 40% =
35. 35.430 increased by 50% =
36. 36.725 increased by 40% =
37. 37.800 decreased by 8% =
38. 38.164 increased by 25% =
39. 39.755 increased by 20% =
40. 40.540 decreased by 30% =

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