Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 338 · 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. 1.300 increased by 10% =
2. 2.528 decreased by 75% =
3. 3.660 decreased by 5% =
4. 4.390 increased by 60% =
5. 5.75 decreased by 8% =
6. 6.396 decreased by 25% =
7. 7.692 decreased by 75% =
8. 8.480 decreased by 10% =
9. 9.250 decreased by 8% =
10. 10.75 increased by 20% =
11. 11.320 increased by 60% =
12. 12.140 decreased by 35% =
13. 13.772 decreased by 50% =
14. 14.140 decreased by 5% =
15. 15.450 increased by 12% =
16. 16.100 increased by 30% =
17. 17.122 increased by 50% =
18. 18.174 increased by 50% =
19. 19.415 increased by 60% =
20. 20.240 increased by 15% =
21. 21.125 decreased by 60% =
22. 22.132 decreased by 25% =
23. 23.365 decreased by 60% =
24. 24.240 decreased by 15% =
25. 25.600 decreased by 10% =
26. 26.620 decreased by 75% =
27. 27.660 increased by 15% =
28. 28.70 increased by 10% =
29. 29.432 decreased by 75% =
30. 30.640 increased by 25% =
31. 31.680 decreased by 35% =
32. 32.575 increased by 8% =
33. 33.740 decreased by 10% =
34. 34.400 decreased by 8% =
35. 35.700 decreased by 35% =
36. 36.176 increased by 75% =
37. 37.336 decreased by 25% =
38. 38.90 increased by 30% =
39. 39.680 decreased by 25% =
40. 40.280 decreased by 15% =

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