Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 782 · 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. 2.490 decreased by 20% =
3. 3.410 decreased by 60% =
4. 4.88 decreased by 75% =
5. 5.620 decreased by 5% =
6. 6.200 increased by 30% =
7. 7.385 decreased by 60% =
8. 8.770 decreased by 40% =
9. 9.765 decreased by 20% =
10. 10.500 decreased by 10% =
11. 11.580 decreased by 15% =
12. 12.220 decreased by 15% =
13. 13.340 increased by 35% =
14. 14.585 increased by 40% =
15. 15.790 decreased by 30% =
16. 16.400 increased by 12% =
17. 17.575 decreased by 8% =
18. 18.225 increased by 12% =
19. 19.105 increased by 20% =
20. 20.240 decreased by 15% =
21. 21.65 decreased by 40% =
22. 22.600 increased by 12% =
23. 23.260 decreased by 25% =
24. 24.668 decreased by 75% =
25. 25.516 increased by 25% =
26. 26.50 decreased by 30% =
27. 27.528 increased by 25% =
28. 28.360 increased by 15% =
29. 29.700 increased by 40% =
30. 30.425 increased by 12% =
31. 31.220 increased by 15% =
32. 32.680 decreased by 5% =
33. 33.800 increased by 5% =
34. 34.300 increased by 12% =
35. 35.570 decreased by 20% =
36. 36.320 increased by 20% =
37. 37.335 increased by 60% =
38. 38.796 increased by 75% =
39. 39.565 increased by 40% =
40. 40.100 increased by 35% =

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