Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 610 · 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. 1.708 increased by 75% =
2. 2.280 decreased by 35% =
3. 3.90 increased by 50% =
4. 4.225 decreased by 12% =
5. 5.140 increased by 10% =
6. 6.800 decreased by 35% =
7. 7.232 increased by 50% =
8. 8.700 increased by 30% =
9. 9.300 decreased by 5% =
10. 10.650 decreased by 12% =
11. 11.595 increased by 20% =
12. 12.135 increased by 60% =
13. 13.500 decreased by 35% =
14. 14.192 decreased by 75% =
15. 15.80 decreased by 35% =
16. 16.150 increased by 8% =
17. 17.240 decreased by 15% =
18. 18.575 decreased by 40% =
19. 19.750 decreased by 12% =
20. 20.560 decreased by 35% =
21. 21.250 decreased by 30% =
22. 22.65 decreased by 40% =
23. 23.500 decreased by 75% =
24. 24.742 decreased by 50% =
25. 25.615 increased by 60% =
26. 26.425 increased by 12% =
27. 27.600 decreased by 5% =
28. 28.370 increased by 20% =
29. 29.136 increased by 75% =
30. 30.690 decreased by 40% =
31. 31.800 increased by 15% =
32. 32.244 decreased by 75% =
33. 33.380 decreased by 35% =
34. 34.360 decreased by 35% =
35. 35.352 increased by 25% =
36. 36.800 decreased by 60% =
37. 37.292 increased by 50% =
38. 38.150 decreased by 10% =
39. 39.64 decreased by 25% =
40. 40.750 increased by 8% =

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