Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 756 · 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. 1.580 decreased by 15% =
2. 2.630 decreased by 20% =
3. 3.80 increased by 15% =
4. 4.560 increased by 10% =
5. 5.398 decreased by 50% =
6. 6.360 increased by 60% =
7. 7.384 decreased by 75% =
8. 8.190 increased by 60% =
9. 9.220 decreased by 35% =
10. 10.200 increased by 30% =
11. 11.336 increased by 25% =
12. 12.170 increased by 20% =
13. 13.520 increased by 40% =
14. 14.360 decreased by 75% =
15. 15.538 increased by 50% =
16. 16.55 decreased by 40% =
17. 17.468 increased by 25% =
18. 18.300 decreased by 20% =
19. 19.660 decreased by 40% =
20. 20.225 increased by 12% =
21. 21.675 decreased by 20% =
22. 22.515 decreased by 20% =
23. 23.176 decreased by 25% =
24. 24.50 increased by 10% =
25. 25.425 increased by 8% =
26. 26.575 increased by 8% =
27. 27.800 decreased by 25% =
28. 28.520 decreased by 5% =
29. 29.266 decreased by 50% =
30. 30.300 decreased by 8% =
31. 31.172 decreased by 75% =
32. 32.60 increased by 5% =
33. 33.300 decreased by 12% =
34. 34.305 increased by 40% =
35. 35.600 decreased by 35% =
36. 36.200 decreased by 15% =
37. 37.460 decreased by 60% =
38. 38.420 increased by 20% =
39. 39.620 increased by 20% =
40. 40.200 increased by 15% =

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