Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 753 · 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 decreased by 30% =
2. 2.320 decreased by 5% =
3. 3.274 increased by 50% =
4. 4.560 decreased by 20% =
5. 5.380 increased by 40% =
6. 6.650 decreased by 30% =
7. 7.500 increased by 30% =
8. 8.744 increased by 25% =
9. 9.275 decreased by 12% =
10. 10.120 decreased by 15% =
11. 11.245 decreased by 40% =
12. 12.40 increased by 5% =
13. 13.345 decreased by 60% =
14. 14.120 increased by 5% =
15. 15.104 increased by 25% =
16. 16.740 decreased by 40% =
17. 17.400 increased by 15% =
18. 18.130 increased by 30% =
19. 19.310 increased by 10% =
20. 20.270 increased by 30% =
21. 21.275 increased by 8% =
22. 22.100 increased by 15% =
23. 23.748 increased by 75% =
24. 24.325 increased by 12% =
25. 25.665 increased by 60% =
26. 26.60 increased by 25% =
27. 27.740 decreased by 5% =
28. 28.280 decreased by 35% =
29. 29.40 increased by 35% =
30. 30.500 increased by 8% =
31. 31.120 decreased by 10% =
32. 32.340 decreased by 20% =
33. 33.70 increased by 10% =
34. 34.500 increased by 10% =
35. 35.256 increased by 50% =
36. 36.420 increased by 60% =
37. 37.225 increased by 8% =
38. 38.250 decreased by 10% =
39. 39.350 decreased by 10% =
40. 40.120 decreased by 5% =

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