Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 77 · 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. 1.620 decreased by 5% =
2. 2.296 decreased by 50% =
3. 3.200 increased by 15% =
4. 4.410 decreased by 20% =
5. 5.270 increased by 10% =
6. 6.310 increased by 20% =
7. 7.320 increased by 20% =
8. 8.700 increased by 5% =
9. 9.480 increased by 60% =
10. 10.570 increased by 10% =
11. 11.764 increased by 75% =
12. 12.276 increased by 50% =
13. 13.760 decreased by 10% =
14. 14.420 decreased by 35% =
15. 15.720 decreased by 15% =
16. 16.560 increased by 15% =
17. 17.150 decreased by 12% =
18. 18.640 increased by 5% =
19. 19.610 increased by 20% =
20. 20.665 increased by 60% =
21. 21.720 decreased by 5% =
22. 22.216 decreased by 75% =
23. 23.760 increased by 15% =
24. 24.162 decreased by 50% =
25. 25.324 increased by 50% =
26. 26.800 decreased by 8% =
27. 27.660 increased by 5% =
28. 28.460 decreased by 5% =
29. 29.202 increased by 50% =
30. 30.350 decreased by 30% =
31. 31.625 increased by 12% =
32. 32.250 increased by 8% =
33. 33.50 increased by 8% =
34. 34.540 decreased by 60% =
35. 35.760 decreased by 10% =
36. 36.430 increased by 30% =
37. 37.290 decreased by 10% =
38. 38.335 increased by 20% =
39. 39.40 decreased by 10% =
40. 40.715 increased by 20% =

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