Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 969 · 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. 1.50 increased by 12% =
2. 2.100 increased by 8% =
3. 3.204 increased by 75% =
4. 4.268 increased by 75% =
5. 5.450 increased by 20% =
6. 6.530 decreased by 60% =
7. 7.450 increased by 30% =
8. 8.80 decreased by 60% =
9. 9.490 decreased by 20% =
10. 10.660 decreased by 15% =
11. 11.168 decreased by 75% =
12. 12.228 increased by 75% =
13. 13.705 decreased by 20% =
14. 14.50 decreased by 10% =
15. 15.580 decreased by 30% =
16. 16.360 increased by 60% =
17. 17.240 increased by 35% =
18. 18.800 increased by 12% =
19. 19.40 increased by 5% =
20. 20.410 increased by 30% =
21. 21.148 increased by 75% =
22. 22.510 decreased by 10% =
23. 23.340 increased by 30% =
24. 24.200 increased by 50% =
25. 25.75 decreased by 12% =
26. 26.625 decreased by 8% =
27. 27.600 decreased by 10% =
28. 28.700 increased by 12% =
29. 29.370 increased by 50% =
30. 30.150 increased by 20% =
31. 31.40 increased by 5% =
32. 32.540 decreased by 5% =
33. 33.120 increased by 15% =
34. 34.86 decreased by 50% =
35. 35.680 increased by 5% =
36. 36.690 increased by 30% =
37. 37.60 increased by 50% =
38. 38.240 increased by 35% =
39. 39.165 increased by 60% =
40. 40.214 increased by 50% =

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