Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 841 · 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. 1.650 increased by 30% =
2. 2.120 increased by 30% =
3. 3.260 decreased by 40% =
4. 4.525 decreased by 8% =
5. 5.40 increased by 5% =
6. 6.520 decreased by 5% =
7. 7.700 increased by 5% =
8. 8.235 decreased by 40% =
9. 9.332 increased by 50% =
10. 10.505 decreased by 40% =
11. 11.452 decreased by 25% =
12. 12.665 increased by 20% =
13. 13.140 decreased by 5% =
14. 14.620 decreased by 75% =
15. 15.310 increased by 10% =
16. 16.100 increased by 8% =
17. 17.780 decreased by 15% =
18. 18.725 decreased by 8% =
19. 19.180 increased by 15% =
20. 20.308 increased by 25% =
21. 21.300 decreased by 75% =
22. 22.575 increased by 12% =
23. 23.340 decreased by 10% =
24. 24.100 increased by 12% =
25. 25.60 increased by 35% =
26. 26.104 decreased by 50% =
27. 27.150 decreased by 12% =
28. 28.480 increased by 5% =
29. 29.40 increased by 30% =
30. 30.800 decreased by 12% =
31. 31.645 increased by 40% =
32. 32.220 increased by 15% =
33. 33.50 decreased by 12% =
34. 34.168 decreased by 75% =
35. 35.580 increased by 35% =
36. 36.450 decreased by 40% =
37. 37.72 increased by 75% =
38. 38.370 increased by 30% =
39. 39.736 increased by 25% =
40. 40.800 increased by 15% =

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