Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 681 · 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. 1.416 decreased by 75% =
2. 2.556 decreased by 25% =
3. 3.612 increased by 75% =
4. 4.790 increased by 30% =
5. 5.636 decreased by 25% =
6. 6.330 increased by 10% =
7. 7.120 increased by 15% =
8. 8.690 decreased by 50% =
9. 9.44 decreased by 75% =
10. 10.96 decreased by 25% =
11. 11.365 decreased by 40% =
12. 12.656 increased by 50% =
13. 13.500 increased by 12% =
14. 14.280 decreased by 5% =
15. 15.60 increased by 50% =
16. 16.425 increased by 8% =
17. 17.740 increased by 25% =
18. 18.520 decreased by 5% =
19. 19.630 increased by 10% =
20. 20.235 increased by 40% =
21. 21.210 decreased by 40% =
22. 22.298 increased by 50% =
23. 23.540 increased by 20% =
24. 24.80 decreased by 10% =
25. 25.770 decreased by 10% =
26. 26.675 increased by 8% =
27. 27.172 decreased by 50% =
28. 28.740 increased by 15% =
29. 29.50 increased by 8% =
30. 30.525 increased by 40% =
31. 31.150 decreased by 60% =
32. 32.160 decreased by 15% =
33. 33.628 increased by 75% =
34. 34.800 decreased by 10% =
35. 35.40 decreased by 15% =
36. 36.160 decreased by 35% =
37. 37.410 increased by 30% =
38. 38.775 increased by 8% =
39. 39.380 decreased by 30% =
40. 40.60 increased by 15% =

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