Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 728 · 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. 1.668 increased by 75% =
2. 2.168 decreased by 75% =
3. 3.100 increased by 12% =
4. 4.110 decreased by 20% =
5. 5.270 decreased by 10% =
6. 6.520 increased by 30% =
7. 7.112 decreased by 50% =
8. 8.100 increased by 5% =
9. 9.450 increased by 60% =
10. 10.245 decreased by 20% =
11. 11.60 decreased by 15% =
12. 12.146 increased by 50% =
13. 13.115 decreased by 20% =
14. 14.425 decreased by 8% =
15. 15.50 increased by 20% =
16. 16.580 increased by 5% =
17. 17.220 decreased by 15% =
18. 18.180 increased by 15% =
19. 19.100 increased by 8% =
20. 20.300 increased by 5% =
21. 21.650 decreased by 10% =
22. 22.325 increased by 8% =
23. 23.340 decreased by 5% =
24. 24.680 increased by 35% =
25. 25.676 decreased by 75% =
26. 26.675 decreased by 12% =
27. 27.700 decreased by 15% =
28. 28.100 decreased by 8% =
29. 29.660 decreased by 5% =
30. 30.420 increased by 30% =
31. 31.235 increased by 60% =
32. 32.800 decreased by 30% =
33. 33.400 increased by 60% =
34. 34.500 decreased by 20% =
35. 35.632 increased by 50% =
36. 36.740 increased by 5% =
37. 37.140 decreased by 5% =
38. 38.670 increased by 30% =
39. 39.420 increased by 35% =
40. 40.60 increased by 35% =

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