Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 651 · 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. 1.335 increased by 40% =
2. 2.508 decreased by 75% =
3. 3.160 increased by 30% =
4. 4.440 decreased by 5% =
5. 5.475 increased by 12% =
6. 6.76 increased by 75% =
7. 7.600 increased by 30% =
8. 8.560 increased by 5% =
9. 9.792 increased by 75% =
10. 10.72 decreased by 50% =
11. 11.300 increased by 5% =
12. 12.800 increased by 5% =
13. 13.452 decreased by 75% =
14. 14.472 decreased by 75% =
15. 15.475 increased by 8% =
16. 16.500 decreased by 12% =
17. 17.726 increased by 50% =
18. 18.800 decreased by 8% =
19. 19.800 decreased by 35% =
20. 20.530 increased by 30% =
21. 21.200 decreased by 10% =
22. 22.700 decreased by 30% =
23. 23.140 increased by 15% =
24. 24.216 decreased by 50% =
25. 25.760 increased by 15% =
26. 26.108 decreased by 50% =
27. 27.305 increased by 60% =
28. 28.592 increased by 25% =
29. 29.350 increased by 30% =
30. 30.180 increased by 15% =
31. 31.250 decreased by 30% =
32. 32.150 increased by 30% =
33. 33.528 decreased by 25% =
34. 34.260 decreased by 5% =
35. 35.210 increased by 10% =
36. 36.190 decreased by 10% =
37. 37.40 decreased by 60% =
38. 38.40 decreased by 10% =
39. 39.662 increased by 50% =
40. 40.740 decreased by 35% =

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