Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 935 · 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. 1.380 decreased by 50% =
2. 2.720 increased by 35% =
3. 3.98 increased by 50% =
4. 4.100 decreased by 15% =
5. 5.125 increased by 8% =
6. 6.680 increased by 5% =
7. 7.675 decreased by 12% =
8. 8.376 decreased by 50% =
9. 9.624 increased by 25% =
10. 10.80 decreased by 35% =
11. 11.300 decreased by 12% =
12. 12.195 increased by 60% =
13. 13.800 decreased by 5% =
14. 14.720 increased by 5% =
15. 15.320 increased by 40% =
16. 16.170 increased by 10% =
17. 17.190 decreased by 30% =
18. 18.550 increased by 30% =
19. 19.284 increased by 25% =
20. 20.560 decreased by 15% =
21. 21.460 decreased by 10% =
22. 22.625 increased by 12% =
23. 23.120 increased by 10% =
24. 24.120 increased by 40% =
25. 25.80 increased by 60% =
26. 26.470 decreased by 10% =
27. 27.100 increased by 5% =
28. 28.130 decreased by 30% =
29. 29.90 increased by 10% =
30. 30.310 increased by 10% =
31. 31.420 decreased by 15% =
32. 32.600 increased by 30% =
33. 33.160 increased by 15% =
34. 34.560 decreased by 40% =
35. 35.400 decreased by 8% =
36. 36.480 decreased by 10% =
37. 37.600 increased by 8% =
38. 38.480 decreased by 15% =
39. 39.710 increased by 60% =
40. 40.150 increased by 12% =

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