Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 273 · 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. 1.554 increased by 50% =
2. 2.340 decreased by 60% =
3. 3.80 increased by 15% =
4. 4.272 increased by 25% =
5. 5.375 increased by 12% =
6. 6.245 increased by 20% =
7. 7.128 decreased by 25% =
8. 8.275 increased by 8% =
9. 9.180 increased by 5% =
10. 10.220 decreased by 5% =
11. 11.230 increased by 40% =
12. 12.422 increased by 50% =
13. 13.600 decreased by 8% =
14. 14.54 increased by 50% =
15. 15.120 decreased by 75% =
16. 16.615 increased by 60% =
17. 17.512 increased by 75% =
18. 18.600 decreased by 15% =
19. 19.800 increased by 15% =
20. 20.250 increased by 12% =
21. 21.230 decreased by 20% =
22. 22.192 decreased by 75% =
23. 23.590 increased by 40% =
24. 24.430 increased by 30% =
25. 25.200 increased by 40% =
26. 26.340 decreased by 15% =
27. 27.390 decreased by 50% =
28. 28.250 increased by 8% =
29. 29.415 decreased by 20% =
30. 30.635 increased by 20% =
31. 31.288 decreased by 25% =
32. 32.660 decreased by 75% =
33. 33.188 increased by 75% =
34. 34.165 decreased by 40% =
35. 35.750 decreased by 8% =
36. 36.160 increased by 5% =
37. 37.600 decreased by 15% =
38. 38.580 decreased by 5% =
39. 39.680 decreased by 30% =
40. 40.755 increased by 60% =

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