Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 855 · 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. 1.240 increased by 10% =
2. 2.575 increased by 60% =
3. 3.580 increased by 40% =
4. 4.740 decreased by 5% =
5. 5.690 decreased by 10% =
6. 6.600 increased by 8% =
7. 7.240 increased by 15% =
8. 8.420 decreased by 25% =
9. 9.60 decreased by 40% =
10. 10.656 increased by 75% =
11. 11.324 increased by 75% =
12. 12.100 decreased by 5% =
13. 13.800 decreased by 12% =
14. 14.190 decreased by 20% =
15. 15.724 increased by 75% =
16. 16.670 increased by 30% =
17. 17.720 increased by 10% =
18. 18.244 increased by 50% =
19. 19.130 increased by 40% =
20. 20.60 decreased by 40% =
21. 21.620 increased by 10% =
22. 22.770 decreased by 30% =
23. 23.500 increased by 25% =
24. 24.592 increased by 75% =
25. 25.508 increased by 75% =
26. 26.390 increased by 10% =
27. 27.425 decreased by 8% =
28. 28.50 decreased by 12% =
29. 29.530 increased by 60% =
30. 30.770 increased by 20% =
31. 31.372 increased by 25% =
32. 32.180 decreased by 20% =
33. 33.320 decreased by 5% =
34. 34.245 increased by 20% =
35. 35.705 increased by 20% =
36. 36.125 increased by 20% =
37. 37.380 increased by 30% =
38. 38.444 decreased by 25% =
39. 39.132 increased by 75% =
40. 40.150 increased by 12% =

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