Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 684 · 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. 1.500 increased by 30% =
2. 2.620 decreased by 10% =
3. 3.200 increased by 35% =
4. 4.400 increased by 20% =
5. 5.750 increased by 8% =
6. 6.635 increased by 40% =
7. 7.580 increased by 15% =
8. 8.800 increased by 60% =
9. 9.714 decreased by 50% =
10. 10.400 increased by 15% =
11. 11.330 decreased by 10% =
12. 12.200 increased by 35% =
13. 13.640 increased by 10% =
14. 14.250 decreased by 8% =
15. 15.220 increased by 40% =
16. 16.575 decreased by 20% =
17. 17.60 decreased by 5% =
18. 18.250 increased by 50% =
19. 19.650 decreased by 30% =
20. 20.175 increased by 12% =
21. 21.40 increased by 30% =
22. 22.188 decreased by 75% =
23. 23.675 decreased by 12% =
24. 24.355 decreased by 40% =
25. 25.340 increased by 5% =
26. 26.660 decreased by 5% =
27. 27.340 increased by 35% =
28. 28.740 decreased by 5% =
29. 29.460 decreased by 30% =
30. 30.52 increased by 75% =
31. 31.140 decreased by 75% =
32. 32.80 increased by 10% =
33. 33.780 increased by 5% =
34. 34.380 increased by 5% =
35. 35.650 increased by 8% =
36. 36.360 increased by 20% =
37. 37.780 decreased by 15% =
38. 38.90 increased by 10% =
39. 39.415 increased by 20% =
40. 40.40 decreased by 15% =

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