Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 583 · 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. 1.430 increased by 20% =
2. 2.225 increased by 8% =
3. 3.40 increased by 5% =
4. 4.200 decreased by 15% =
5. 5.700 increased by 15% =
6. 6.670 decreased by 20% =
7. 7.120 increased by 60% =
8. 8.255 increased by 20% =
9. 9.400 decreased by 12% =
10. 10.620 increased by 15% =
11. 11.500 decreased by 35% =
12. 12.70 increased by 50% =
13. 13.660 increased by 15% =
14. 14.520 increased by 40% =
15. 15.475 increased by 40% =
16. 16.600 increased by 15% =
17. 17.780 decreased by 75% =
18. 18.120 increased by 35% =
19. 19.340 decreased by 15% =
20. 20.680 decreased by 15% =
21. 21.260 decreased by 5% =
22. 22.90 decreased by 10% =
23. 23.116 decreased by 50% =
24. 24.528 increased by 25% =
25. 25.800 decreased by 15% =
26. 26.780 increased by 35% =
27. 27.660 decreased by 35% =
28. 28.230 decreased by 10% =
29. 29.50 increased by 10% =
30. 30.660 decreased by 25% =
31. 31.184 decreased by 25% =
32. 32.100 decreased by 12% =
33. 33.185 increased by 60% =
34. 34.216 decreased by 25% =
35. 35.272 decreased by 50% =
36. 36.560 increased by 15% =
37. 37.265 decreased by 20% =
38. 38.255 decreased by 60% =
39. 39.100 increased by 12% =
40. 40.40 increased by 75% =

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