Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 532 · 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. 1.450 decreased by 10% =
2. 2.636 decreased by 25% =
3. 3.60 decreased by 15% =
4. 4.480 decreased by 30% =
5. 5.60 decreased by 5% =
6. 6.500 increased by 15% =
7. 7.650 increased by 10% =
8. 8.600 increased by 8% =
9. 9.110 decreased by 40% =
10. 10.375 decreased by 12% =
11. 11.280 decreased by 50% =
12. 12.225 increased by 20% =
13. 13.170 increased by 20% =
14. 14.780 decreased by 35% =
15. 15.700 increased by 8% =
16. 16.600 decreased by 8% =
17. 17.260 increased by 35% =
18. 18.612 decreased by 25% =
19. 19.320 increased by 35% =
20. 20.50 decreased by 12% =
21. 21.254 increased by 50% =
22. 22.680 increased by 5% =
23. 23.730 decreased by 40% =
24. 24.600 increased by 60% =
25. 25.475 decreased by 8% =
26. 26.596 decreased by 75% =
27. 27.575 increased by 12% =
28. 28.128 increased by 75% =
29. 29.120 decreased by 5% =
30. 30.680 decreased by 5% =
31. 31.472 decreased by 75% =
32. 32.720 decreased by 30% =
33. 33.775 increased by 40% =
34. 34.250 decreased by 8% =
35. 35.630 increased by 10% =
36. 36.570 decreased by 30% =
37. 37.656 increased by 75% =
38. 38.665 increased by 20% =
39. 39.550 decreased by 30% =
40. 40.130 increased by 30% =

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