Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 729 · 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 5% =
2. 2.420 increased by 15% =
3. 3.150 decreased by 12% =
4. 4.425 increased by 8% =
5. 5.675 decreased by 12% =
6. 6.130 decreased by 10% =
7. 7.700 decreased by 15% =
8. 8.400 decreased by 35% =
9. 9.140 decreased by 15% =
10. 10.500 decreased by 12% =
11. 11.80 decreased by 35% =
12. 12.384 increased by 75% =
13. 13.90 decreased by 20% =
14. 14.426 decreased by 50% =
15. 15.180 decreased by 35% =
16. 16.200 decreased by 30% =
17. 17.350 increased by 10% =
18. 18.300 increased by 35% =
19. 19.145 increased by 40% =
20. 20.400 increased by 50% =
21. 21.530 increased by 10% =
22. 22.504 increased by 25% =
23. 23.290 decreased by 20% =
24. 24.635 increased by 20% =
25. 25.325 increased by 20% =
26. 26.732 increased by 50% =
27. 27.650 decreased by 8% =
28. 28.725 decreased by 20% =
29. 29.288 decreased by 25% =
30. 30.600 decreased by 30% =
31. 31.200 increased by 15% =
32. 32.220 increased by 50% =
33. 33.285 increased by 40% =
34. 34.175 decreased by 12% =
35. 35.140 decreased by 5% =
36. 36.680 increased by 5% =
37. 37.520 decreased by 60% =
38. 38.60 decreased by 10% =
39. 39.432 increased by 50% =
40. 40.335 increased by 40% =

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