Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 173 · 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. 1.660 increased by 15% =
2. 2.350 increased by 8% =
3. 3.84 decreased by 25% =
4. 4.530 increased by 10% =
5. 5.640 decreased by 15% =
6. 6.340 increased by 35% =
7. 7.360 increased by 15% =
8. 8.640 increased by 15% =
9. 9.280 increased by 5% =
10. 10.165 decreased by 60% =
11. 11.130 decreased by 50% =
12. 12.375 decreased by 12% =
13. 13.200 decreased by 30% =
14. 14.250 increased by 8% =
15. 15.700 decreased by 35% =
16. 16.640 increased by 15% =
17. 17.116 decreased by 75% =
18. 18.650 increased by 8% =
19. 19.340 increased by 5% =
20. 20.442 decreased by 50% =
21. 21.420 increased by 35% =
22. 22.630 increased by 10% =
23. 23.675 increased by 8% =
24. 24.655 decreased by 60% =
25. 25.220 increased by 20% =
26. 26.200 increased by 30% =
27. 27.70 decreased by 60% =
28. 28.572 increased by 25% =
29. 29.436 decreased by 75% =
30. 30.720 decreased by 15% =
31. 31.200 increased by 30% =
32. 32.404 decreased by 50% =
33. 33.50 decreased by 8% =
34. 34.100 increased by 8% =
35. 35.325 increased by 12% =
36. 36.215 increased by 60% =
37. 37.560 decreased by 30% =
38. 38.684 increased by 75% =
39. 39.168 increased by 75% =
40. 40.225 decreased by 8% =

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