Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 568 · 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. 1.740 decreased by 20% =
2. 2.135 increased by 40% =
3. 3.220 increased by 25% =
4. 4.110 increased by 30% =
5. 5.350 decreased by 60% =
6. 6.770 increased by 10% =
7. 7.420 increased by 15% =
8. 8.260 increased by 5% =
9. 9.220 decreased by 10% =
10. 10.625 increased by 8% =
11. 11.668 increased by 75% =
12. 12.305 increased by 20% =
13. 13.380 increased by 50% =
14. 14.175 decreased by 20% =
15. 15.650 increased by 20% =
16. 16.700 decreased by 15% =
17. 17.650 decreased by 10% =
18. 18.600 increased by 10% =
19. 19.800 increased by 15% =
20. 20.340 decreased by 35% =
21. 21.120 increased by 30% =
22. 22.468 increased by 50% =
23. 23.200 increased by 5% =
24. 24.240 increased by 40% =
25. 25.236 increased by 75% =
26. 26.120 increased by 5% =
27. 27.50 decreased by 12% =
28. 28.40 increased by 35% =
29. 29.250 increased by 8% =
30. 30.410 increased by 30% =
31. 31.300 increased by 30% =
32. 32.675 decreased by 12% =
33. 33.660 increased by 15% =
34. 34.270 decreased by 60% =
35. 35.356 decreased by 50% =
36. 36.408 decreased by 25% =
37. 37.620 decreased by 20% =
38. 38.60 increased by 40% =
39. 39.450 decreased by 20% =
40. 40.720 decreased by 15% =

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