Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 778 · 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. 1.720 decreased by 30% =
2. 2.150 increased by 12% =
3. 3.700 decreased by 30% =
4. 4.100 decreased by 5% =
5. 5.230 decreased by 10% =
6. 6.420 increased by 10% =
7. 7.684 increased by 25% =
8. 8.420 decreased by 5% =
9. 9.195 decreased by 60% =
10. 10.280 increased by 5% =
11. 11.396 increased by 75% =
12. 12.80 increased by 35% =
13. 13.460 decreased by 30% =
14. 14.100 increased by 35% =
15. 15.150 decreased by 8% =
16. 16.320 decreased by 25% =
17. 17.700 increased by 25% =
18. 18.120 decreased by 15% =
19. 19.696 increased by 75% =
20. 20.104 increased by 25% =
21. 21.700 decreased by 12% =
22. 22.310 increased by 10% =
23. 23.735 decreased by 60% =
24. 24.275 increased by 60% =
25. 25.670 decreased by 60% =
26. 26.494 increased by 50% =
27. 27.500 decreased by 8% =
28. 28.48 increased by 50% =
29. 29.210 decreased by 50% =
30. 30.602 decreased by 50% =
31. 31.50 decreased by 12% =
32. 32.80 increased by 5% =
33. 33.50 increased by 60% =
34. 34.700 decreased by 12% =
35. 35.336 increased by 50% =
36. 36.100 decreased by 12% =
37. 37.720 increased by 10% =
38. 38.590 decreased by 20% =
39. 39.275 decreased by 8% =
40. 40.650 increased by 10% =

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