Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 637 · 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. 1.405 increased by 20% =
2. 2.50 decreased by 12% =
3. 3.240 increased by 35% =
4. 4.600 increased by 30% =
5. 5.100 increased by 50% =
6. 6.528 decreased by 50% =
7. 7.320 increased by 60% =
8. 8.420 decreased by 20% =
9. 9.260 increased by 5% =
10. 10.100 decreased by 8% =
11. 11.44 increased by 25% =
12. 12.175 increased by 12% =
13. 13.310 increased by 40% =
14. 14.780 increased by 60% =
15. 15.210 decreased by 40% =
16. 16.400 decreased by 15% =
17. 17.150 increased by 20% =
18. 18.160 increased by 5% =
19. 19.475 increased by 12% =
20. 20.156 decreased by 25% =
21. 21.300 decreased by 10% =
22. 22.640 decreased by 60% =
23. 23.760 decreased by 35% =
24. 24.450 increased by 12% =
25. 25.470 increased by 10% =
26. 26.320 increased by 10% =
27. 27.132 increased by 75% =
28. 28.80 decreased by 25% =
29. 29.68 decreased by 25% =
30. 30.120 increased by 5% =
31. 31.700 increased by 35% =
32. 32.590 increased by 10% =
33. 33.110 increased by 60% =
34. 34.340 increased by 15% =
35. 35.60 increased by 10% =
36. 36.580 increased by 5% =
37. 37.360 decreased by 5% =
38. 38.570 increased by 10% =
39. 39.260 decreased by 60% =
40. 40.524 increased by 25% =

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