Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 606 · 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. 1.665 increased by 40% =
2. 2.560 decreased by 5% =
3. 3.75 increased by 12% =
4. 4.112 decreased by 25% =
5. 5.170 increased by 10% =
6. 6.176 increased by 50% =
7. 7.675 increased by 12% =
8. 8.336 increased by 75% =
9. 9.660 decreased by 75% =
10. 10.280 increased by 15% =
11. 11.220 increased by 35% =
12. 12.250 decreased by 30% =
13. 13.308 increased by 25% =
14. 14.60 decreased by 30% =
15. 15.40 increased by 15% =
16. 16.510 decreased by 30% =
17. 17.150 decreased by 8% =
18. 18.630 increased by 10% =
19. 19.725 decreased by 12% =
20. 20.200 increased by 8% =
21. 21.364 increased by 75% =
22. 22.790 increased by 10% =
23. 23.540 increased by 5% =
24. 24.350 decreased by 8% =
25. 25.340 decreased by 5% =
26. 26.110 decreased by 20% =
27. 27.560 increased by 30% =
28. 28.630 increased by 40% =
29. 29.340 increased by 35% =
30. 30.780 decreased by 30% =
31. 31.100 decreased by 12% =
32. 32.406 increased by 50% =
33. 33.444 increased by 25% =
34. 34.615 increased by 40% =
35. 35.395 decreased by 20% =
36. 36.240 increased by 35% =
37. 37.664 increased by 25% =
38. 38.150 increased by 8% =
39. 39.380 increased by 30% =
40. 40.690 increased by 10% =

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