Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 593 · 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. 1.350 increased by 12% =
2. 2.200 decreased by 30% =
3. 3.50 decreased by 60% =
4. 4.320 decreased by 40% =
5. 5.320 decreased by 40% =
6. 6.100 increased by 30% =
7. 7.340 decreased by 35% =
8. 8.695 decreased by 20% =
9. 9.320 decreased by 40% =
10. 10.125 decreased by 12% =
11. 11.680 decreased by 35% =
12. 12.428 increased by 25% =
13. 13.400 increased by 15% =
14. 14.770 decreased by 30% =
15. 15.160 decreased by 60% =
16. 16.525 decreased by 12% =
17. 17.80 increased by 30% =
18. 18.675 increased by 8% =
19. 19.105 decreased by 20% =
20. 20.200 increased by 30% =
21. 21.74 increased by 50% =
22. 22.400 increased by 35% =
23. 23.725 decreased by 12% =
24. 24.272 increased by 75% =
25. 25.410 decreased by 20% =
26. 26.196 decreased by 25% =
27. 27.150 increased by 60% =
28. 28.608 increased by 25% =
29. 29.480 decreased by 10% =
30. 30.50 increased by 30% =
31. 31.125 decreased by 8% =
32. 32.190 increased by 10% =
33. 33.564 decreased by 75% =
34. 34.400 decreased by 40% =
35. 35.660 decreased by 60% =
36. 36.720 increased by 15% =
37. 37.40 increased by 15% =
38. 38.615 decreased by 60% =
39. 39.40 increased by 75% =
40. 40.324 increased by 75% =

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