Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 128 · 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. 1.700 decreased by 50% =
2. 2.220 decreased by 5% =
3. 3.95 decreased by 20% =
4. 4.258 increased by 50% =
5. 5.370 increased by 30% =
6. 6.340 decreased by 15% =
7. 7.640 increased by 35% =
8. 8.60 decreased by 35% =
9. 9.375 decreased by 60% =
10. 10.562 decreased by 50% =
11. 11.660 increased by 25% =
12. 12.408 increased by 75% =
13. 13.40 increased by 10% =
14. 14.120 increased by 5% =
15. 15.756 increased by 50% =
16. 16.400 decreased by 15% =
17. 17.716 increased by 75% =
18. 18.504 decreased by 75% =
19. 19.360 increased by 35% =
20. 20.220 decreased by 15% =
21. 21.608 decreased by 25% =
22. 22.140 decreased by 35% =
23. 23.150 decreased by 30% =
24. 24.60 increased by 5% =
25. 25.580 increased by 25% =
26. 26.495 decreased by 20% =
27. 27.654 decreased by 50% =
28. 28.760 decreased by 5% =
29. 29.775 increased by 8% =
30. 30.232 decreased by 75% =
31. 31.480 increased by 35% =
32. 32.572 decreased by 50% =
33. 33.740 increased by 5% =
34. 34.345 increased by 60% =
35. 35.415 decreased by 20% =
36. 36.760 increased by 15% =
37. 37.740 increased by 15% =
38. 38.140 increased by 60% =
39. 39.75 increased by 8% =
40. 40.275 decreased by 8% =

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