Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 148 · 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. 1.55 increased by 40% =
2. 2.680 increased by 5% =
3. 3.600 increased by 8% =
4. 4.470 decreased by 10% =
5. 5.675 increased by 12% =
6. 6.625 decreased by 60% =
7. 7.664 decreased by 75% =
8. 8.200 decreased by 40% =
9. 9.90 increased by 30% =
10. 10.40 decreased by 20% =
11. 11.140 decreased by 15% =
12. 12.110 increased by 50% =
13. 13.175 decreased by 8% =
14. 14.325 increased by 8% =
15. 15.200 decreased by 60% =
16. 16.425 decreased by 12% =
17. 17.600 increased by 15% =
18. 18.528 increased by 50% =
19. 19.270 increased by 20% =
20. 20.240 increased by 25% =
21. 21.100 increased by 5% =
22. 22.340 decreased by 15% =
23. 23.320 decreased by 15% =
24. 24.180 increased by 5% =
25. 25.500 decreased by 35% =
26. 26.290 decreased by 30% =
27. 27.660 increased by 15% =
28. 28.394 increased by 50% =
29. 29.400 decreased by 25% =
30. 30.130 increased by 30% =
31. 31.560 increased by 15% =
32. 32.44 decreased by 25% =
33. 33.600 decreased by 15% =
34. 34.50 decreased by 10% =
35. 35.495 increased by 60% =
36. 36.100 decreased by 12% =
37. 37.292 increased by 25% =
38. 38.75 increased by 40% =
39. 39.772 decreased by 75% =
40. 40.480 increased by 35% =

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