Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 51 · 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 decreased by 8% =
2. 2.100 increased by 75% =
3. 3.496 decreased by 25% =
4. 4.380 decreased by 15% =
5. 5.500 decreased by 5% =
6. 6.580 increased by 15% =
7. 7.300 decreased by 20% =
8. 8.360 increased by 10% =
9. 9.220 decreased by 5% =
10. 10.760 decreased by 30% =
11. 11.800 decreased by 5% =
12. 12.150 decreased by 10% =
13. 13.688 decreased by 25% =
14. 14.310 decreased by 30% =
15. 15.760 decreased by 60% =
16. 16.416 increased by 75% =
17. 17.375 decreased by 8% =
18. 18.694 decreased by 50% =
19. 19.176 increased by 75% =
20. 20.150 increased by 12% =
21. 21.730 increased by 30% =
22. 22.765 decreased by 40% =
23. 23.660 decreased by 10% =
24. 24.790 increased by 60% =
25. 25.164 increased by 75% =
26. 26.560 increased by 20% =
27. 27.160 decreased by 35% =
28. 28.284 increased by 25% =
29. 29.505 increased by 20% =
30. 30.720 increased by 35% =
31. 31.530 increased by 60% =
32. 32.270 decreased by 50% =
33. 33.140 increased by 5% =
34. 34.100 increased by 5% =
35. 35.250 decreased by 30% =
36. 36.344 decreased by 75% =
37. 37.310 increased by 10% =
38. 38.700 increased by 35% =
39. 39.50 increased by 12% =
40. 40.604 decreased by 75% =

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