Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 434 · 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. 1.230 increased by 40% =
2. 2.400 increased by 5% =
3. 3.465 decreased by 20% =
4. 4.580 decreased by 35% =
5. 5.445 decreased by 20% =
6. 6.640 increased by 10% =
7. 7.140 increased by 30% =
8. 8.700 decreased by 50% =
9. 9.720 decreased by 40% =
10. 10.600 decreased by 35% =
11. 11.610 increased by 10% =
12. 12.40 increased by 5% =
13. 13.284 increased by 75% =
14. 14.160 decreased by 15% =
15. 15.550 increased by 10% =
16. 16.800 decreased by 35% =
17. 17.260 increased by 35% =
18. 18.370 increased by 10% =
19. 19.420 decreased by 30% =
20. 20.315 decreased by 60% =
21. 21.260 increased by 5% =
22. 22.60 increased by 35% =
23. 23.695 increased by 40% =
24. 24.140 decreased by 30% =
25. 25.308 increased by 25% =
26. 26.495 decreased by 20% =
27. 27.140 decreased by 35% =
28. 28.705 decreased by 60% =
29. 29.105 decreased by 60% =
30. 30.55 decreased by 60% =
31. 31.320 decreased by 10% =
32. 32.200 increased by 60% =
33. 33.365 decreased by 40% =
34. 34.270 decreased by 30% =
35. 35.134 increased by 50% =
36. 36.115 decreased by 40% =
37. 37.640 increased by 5% =
38. 38.550 decreased by 40% =
39. 39.280 increased by 10% =
40. 40.420 increased by 5% =

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