Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 774 · 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. 1.40 increased by 20% =
2. 2.160 increased by 15% =
3. 3.495 increased by 60% =
4. 4.60 increased by 5% =
5. 5.420 increased by 50% =
6. 6.800 increased by 60% =
7. 7.190 decreased by 20% =
8. 8.440 decreased by 5% =
9. 9.335 increased by 40% =
10. 10.412 increased by 25% =
11. 11.110 decreased by 30% =
12. 12.800 increased by 50% =
13. 13.445 decreased by 20% =
14. 14.375 decreased by 20% =
15. 15.80 decreased by 15% =
16. 16.72 decreased by 75% =
17. 17.640 increased by 5% =
18. 18.325 increased by 8% =
19. 19.280 increased by 5% =
20. 20.60 decreased by 15% =
21. 21.600 decreased by 12% =
22. 22.390 increased by 10% =
23. 23.675 increased by 12% =
24. 24.400 decreased by 8% =
25. 25.748 decreased by 25% =
26. 26.180 increased by 75% =
27. 27.320 decreased by 10% =
28. 28.120 decreased by 10% =
29. 29.450 decreased by 10% =
30. 30.150 increased by 12% =
31. 31.316 increased by 50% =
32. 32.56 decreased by 75% =
33. 33.120 increased by 40% =
34. 34.160 increased by 25% =
35. 35.360 increased by 35% =
36. 36.425 decreased by 8% =
37. 37.280 decreased by 35% =
38. 38.625 increased by 12% =
39. 39.434 decreased by 50% =
40. 40.80 decreased by 5% =

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