Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 63 · 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. 1.480 decreased by 5% =
2. 2.572 decreased by 50% =
3. 3.780 decreased by 75% =
4. 4.770 decreased by 40% =
5. 5.570 decreased by 30% =
6. 6.644 increased by 25% =
7. 7.422 decreased by 50% =
8. 8.85 decreased by 40% =
9. 9.190 decreased by 10% =
10. 10.110 increased by 10% =
11. 11.40 increased by 50% =
12. 12.400 increased by 5% =
13. 13.272 increased by 75% =
14. 14.75 increased by 12% =
15. 15.330 decreased by 40% =
16. 16.420 decreased by 10% =
17. 17.120 decreased by 20% =
18. 18.540 decreased by 5% =
19. 19.185 decreased by 40% =
20. 20.500 increased by 8% =
21. 21.645 increased by 40% =
22. 22.440 increased by 5% =
23. 23.560 decreased by 10% =
24. 24.560 increased by 35% =
25. 25.360 increased by 10% =
26. 26.160 increased by 20% =
27. 27.370 decreased by 30% =
28. 28.250 increased by 8% =
29. 29.770 decreased by 50% =
30. 30.590 decreased by 30% =
31. 31.504 increased by 75% =
32. 32.240 increased by 30% =
33. 33.705 increased by 40% =
34. 34.800 decreased by 15% =
35. 35.270 increased by 30% =
36. 36.190 increased by 10% =
37. 37.524 decreased by 75% =
38. 38.335 increased by 60% =
39. 39.675 decreased by 12% =
40. 40.752 increased by 75% =

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