Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 501 · 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. 1.480 decreased by 35% =
2. 2.452 decreased by 25% =
3. 3.610 increased by 20% =
4. 4.788 increased by 50% =
5. 5.608 increased by 50% =
6. 6.580 increased by 10% =
7. 7.80 decreased by 10% =
8. 8.150 decreased by 50% =
9. 9.160 decreased by 35% =
10. 10.652 increased by 75% =
11. 11.88 increased by 25% =
12. 12.620 decreased by 15% =
13. 13.455 decreased by 60% =
14. 14.770 increased by 60% =
15. 15.800 decreased by 40% =
16. 16.260 decreased by 15% =
17. 17.790 increased by 30% =
18. 18.580 increased by 15% =
19. 19.620 increased by 30% =
20. 20.400 increased by 12% =
21. 21.710 decreased by 10% =
22. 22.780 decreased by 35% =
23. 23.448 increased by 25% =
24. 24.352 decreased by 25% =
25. 25.180 decreased by 15% =
26. 26.164 increased by 25% =
27. 27.190 increased by 30% =
28. 28.340 increased by 15% =
29. 29.210 decreased by 10% =
30. 30.268 decreased by 75% =
31. 31.540 decreased by 30% =
32. 32.296 decreased by 75% =
33. 33.300 increased by 8% =
34. 34.480 increased by 15% =
35. 35.740 increased by 35% =
36. 36.260 increased by 5% =
37. 37.160 decreased by 25% =
38. 38.100 increased by 15% =
39. 39.670 increased by 40% =
40. 40.180 decreased by 10% =

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