Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 169 · 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. 1.480 increased by 35% =
2. 2.375 increased by 12% =
3. 3.60 decreased by 15% =
4. 4.780 increased by 5% =
5. 5.510 decreased by 10% =
6. 6.710 decreased by 20% =
7. 7.100 increased by 20% =
8. 8.104 increased by 75% =
9. 9.275 increased by 20% =
10. 10.305 decreased by 40% =
11. 11.800 increased by 8% =
12. 12.575 increased by 12% =
13. 13.195 increased by 60% =
14. 14.660 decreased by 35% =
15. 15.240 decreased by 15% =
16. 16.700 decreased by 20% =
17. 17.430 decreased by 50% =
18. 18.680 decreased by 5% =
19. 19.600 increased by 8% =
20. 20.40 increased by 5% =
21. 21.585 increased by 60% =
22. 22.70 increased by 10% =
23. 23.440 increased by 15% =
24. 24.152 decreased by 75% =
25. 25.100 increased by 12% =
26. 26.500 decreased by 12% =
27. 27.80 decreased by 15% =
28. 28.490 increased by 10% =
29. 29.460 decreased by 20% =
30. 30.134 decreased by 50% =
31. 31.205 decreased by 60% =
32. 32.800 decreased by 15% =
33. 33.675 increased by 8% =
34. 34.160 decreased by 35% =
35. 35.775 increased by 8% =
36. 36.785 decreased by 40% =
37. 37.712 increased by 75% =
38. 38.354 decreased by 50% =
39. 39.192 increased by 25% =
40. 40.575 decreased by 12% =

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