Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 668 · 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. 1.164 increased by 25% =
2. 2.420 increased by 60% =
3. 3.320 decreased by 20% =
4. 4.590 increased by 30% =
5. 5.270 decreased by 10% =
6. 6.180 increased by 15% =
7. 7.140 decreased by 20% =
8. 8.300 decreased by 15% =
9. 9.64 increased by 75% =
10. 10.250 decreased by 40% =
11. 11.575 decreased by 20% =
12. 12.690 decreased by 10% =
13. 13.660 decreased by 10% =
14. 14.460 increased by 35% =
15. 15.525 increased by 60% =
16. 16.225 increased by 8% =
17. 17.324 decreased by 75% =
18. 18.280 decreased by 50% =
19. 19.50 decreased by 30% =
20. 20.500 decreased by 10% =
21. 21.760 increased by 5% =
22. 22.575 increased by 8% =
23. 23.40 decreased by 15% =
24. 24.680 decreased by 5% =
25. 25.370 decreased by 40% =
26. 26.175 increased by 12% =
27. 27.130 decreased by 20% =
28. 28.360 decreased by 15% =
29. 29.40 decreased by 30% =
30. 30.80 decreased by 5% =
31. 31.60 decreased by 75% =
32. 32.660 decreased by 5% =
33. 33.200 decreased by 40% =
34. 34.260 decreased by 30% =
35. 35.700 decreased by 35% =
36. 36.370 increased by 60% =
37. 37.300 decreased by 75% =
38. 38.525 increased by 12% =
39. 39.655 increased by 60% =
40. 40.160 increased by 35% =

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