Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 662 · 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. 1.640 decreased by 15% =
2. 2.750 decreased by 60% =
3. 3.490 increased by 30% =
4. 4.254 decreased by 50% =
5. 5.240 increased by 35% =
6. 6.764 increased by 25% =
7. 7.770 decreased by 30% =
8. 8.255 increased by 20% =
9. 9.160 decreased by 40% =
10. 10.600 decreased by 12% =
11. 11.60 increased by 35% =
12. 12.310 increased by 30% =
13. 13.472 decreased by 25% =
14. 14.500 increased by 5% =
15. 15.600 decreased by 8% =
16. 16.715 decreased by 60% =
17. 17.210 increased by 30% =
18. 18.340 decreased by 5% =
19. 19.496 decreased by 25% =
20. 20.80 decreased by 10% =
21. 21.780 increased by 35% =
22. 22.700 increased by 25% =
23. 23.510 increased by 30% =
24. 24.100 decreased by 8% =
25. 25.100 decreased by 10% =
26. 26.256 increased by 75% =
27. 27.150 decreased by 30% =
28. 28.355 decreased by 60% =
29. 29.210 increased by 10% =
30. 30.200 increased by 5% =
31. 31.110 decreased by 20% =
32. 32.100 decreased by 8% =
33. 33.225 decreased by 8% =
34. 34.550 increased by 10% =
35. 35.645 increased by 40% =
36. 36.490 increased by 20% =
37. 37.776 increased by 75% =
38. 38.340 increased by 35% =
39. 39.280 decreased by 5% =
40. 40.72 decreased by 75% =

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