Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 905 · 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. 1.615 increased by 20% =
2. 2.795 decreased by 20% =
3. 3.472 increased by 25% =
4. 4.260 increased by 35% =
5. 5.700 decreased by 35% =
6. 6.124 increased by 75% =
7. 7.780 decreased by 30% =
8. 8.610 decreased by 30% =
9. 9.650 increased by 8% =
10. 10.500 decreased by 35% =
11. 11.80 increased by 50% =
12. 12.712 decreased by 75% =
13. 13.780 increased by 30% =
14. 14.700 decreased by 12% =
15. 15.134 decreased by 50% =
16. 16.85 decreased by 40% =
17. 17.60 increased by 15% =
18. 18.160 increased by 30% =
19. 19.290 increased by 10% =
20. 20.210 decreased by 40% =
21. 21.480 increased by 10% =
22. 22.504 decreased by 50% =
23. 23.160 decreased by 60% =
24. 24.40 decreased by 5% =
25. 25.160 decreased by 75% =
26. 26.215 decreased by 20% =
27. 27.628 decreased by 75% =
28. 28.300 increased by 30% =
29. 29.165 increased by 40% =
30. 30.360 increased by 30% =
31. 31.152 increased by 25% =
32. 32.556 decreased by 75% =
33. 33.725 decreased by 60% =
34. 34.370 decreased by 10% =
35. 35.100 increased by 5% =
36. 36.400 decreased by 12% =
37. 37.460 decreased by 15% =
38. 38.116 decreased by 50% =
39. 39.175 increased by 8% =
40. 40.385 decreased by 20% =

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