Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 596 · 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. 1.786 decreased by 50% =
2. 2.275 increased by 60% =
3. 3.310 decreased by 30% =
4. 4.268 increased by 75% =
5. 5.460 decreased by 15% =
6. 6.300 decreased by 15% =
7. 7.500 decreased by 12% =
8. 8.320 increased by 30% =
9. 9.620 decreased by 10% =
10. 10.425 increased by 8% =
11. 11.250 decreased by 40% =
12. 12.200 decreased by 35% =
13. 13.290 increased by 30% =
14. 14.215 decreased by 40% =
15. 15.710 decreased by 30% =
16. 16.340 increased by 15% =
17. 17.340 decreased by 15% =
18. 18.250 increased by 8% =
19. 19.310 increased by 20% =
20. 20.735 decreased by 20% =
21. 21.50 increased by 30% =
22. 22.140 increased by 15% =
23. 23.148 increased by 75% =
24. 24.150 decreased by 12% =
25. 25.110 increased by 20% =
26. 26.750 increased by 10% =
27. 27.475 increased by 12% =
28. 28.480 increased by 75% =
29. 29.224 increased by 25% =
30. 30.224 increased by 75% =
31. 31.440 increased by 30% =
32. 32.240 decreased by 35% =
33. 33.206 decreased by 50% =
34. 34.420 increased by 15% =
35. 35.700 decreased by 10% =
36. 36.110 decreased by 20% =
37. 37.200 increased by 25% =
38. 38.205 increased by 40% =
39. 39.364 decreased by 75% =
40. 40.740 increased by 20% =

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