Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 105 · 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. 1.775 increased by 60% =
2. 2.380 increased by 35% =
3. 3.710 decreased by 10% =
4. 4.550 decreased by 10% =
5. 5.700 increased by 15% =
6. 6.700 increased by 25% =
7. 7.484 decreased by 75% =
8. 8.150 decreased by 10% =
9. 9.220 increased by 15% =
10. 10.505 decreased by 60% =
11. 11.160 decreased by 40% =
12. 12.440 increased by 15% =
13. 13.425 increased by 12% =
14. 14.475 decreased by 12% =
15. 15.250 increased by 40% =
16. 16.268 decreased by 50% =
17. 17.230 increased by 10% =
18. 18.200 increased by 5% =
19. 19.235 increased by 20% =
20. 20.620 decreased by 20% =
21. 21.310 increased by 20% =
22. 22.300 decreased by 60% =
23. 23.50 increased by 30% =
24. 24.275 decreased by 8% =
25. 25.660 decreased by 5% =
26. 26.326 increased by 50% =
27. 27.220 increased by 15% =
28. 28.775 decreased by 40% =
29. 29.240 decreased by 30% =
30. 30.660 decreased by 15% =
31. 31.600 increased by 10% =
32. 32.265 increased by 40% =
33. 33.264 decreased by 25% =
34. 34.430 decreased by 10% =
35. 35.70 increased by 10% =
36. 36.475 increased by 8% =
37. 37.565 decreased by 60% =
38. 38.180 increased by 5% =
39. 39.320 decreased by 5% =
40. 40.700 decreased by 35% =

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