Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 961 · 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. 1.44 increased by 50% =
2. 2.225 decreased by 40% =
3. 3.340 decreased by 30% =
4. 4.575 decreased by 60% =
5. 5.712 decreased by 50% =
6. 6.95 decreased by 20% =
7. 7.156 increased by 75% =
8. 8.260 increased by 15% =
9. 9.250 decreased by 8% =
10. 10.180 decreased by 15% =
11. 11.220 increased by 15% =
12. 12.300 decreased by 5% =
13. 13.525 decreased by 8% =
14. 14.235 increased by 20% =
15. 15.100 increased by 35% =
16. 16.625 decreased by 8% =
17. 17.568 increased by 25% =
18. 18.580 decreased by 5% =
19. 19.300 decreased by 35% =
20. 20.164 increased by 75% =
21. 21.440 decreased by 5% =
22. 22.720 increased by 15% =
23. 23.380 decreased by 30% =
24. 24.548 increased by 25% =
25. 25.100 decreased by 8% =
26. 26.220 increased by 15% =
27. 27.220 decreased by 15% =
28. 28.220 decreased by 15% =
29. 29.144 increased by 25% =
30. 30.222 decreased by 50% =
31. 31.720 decreased by 15% =
32. 32.190 decreased by 10% =
33. 33.800 increased by 25% =
34. 34.150 increased by 10% =
35. 35.730 increased by 10% =
36. 36.260 increased by 50% =
37. 37.265 decreased by 40% =
38. 38.560 decreased by 50% =
39. 39.405 decreased by 40% =
40. 40.310 increased by 20% =

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