Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 112 · 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. 1.664 decreased by 25% =
2. 2.670 increased by 40% =
3. 3.140 increased by 40% =
4. 4.780 decreased by 30% =
5. 5.604 decreased by 75% =
6. 6.780 increased by 30% =
7. 7.740 increased by 35% =
8. 8.360 increased by 15% =
9. 9.565 decreased by 20% =
10. 10.500 decreased by 12% =
11. 11.244 increased by 50% =
12. 12.252 decreased by 50% =
13. 13.760 increased by 60% =
14. 14.660 decreased by 5% =
15. 15.558 increased by 50% =
16. 16.700 decreased by 8% =
17. 17.400 increased by 12% =
18. 18.75 decreased by 20% =
19. 19.250 decreased by 20% =
20. 20.425 decreased by 12% =
21. 21.185 increased by 40% =
22. 22.320 decreased by 35% =
23. 23.572 decreased by 50% =
24. 24.85 increased by 40% =
25. 25.210 increased by 30% =
26. 26.420 increased by 10% =
27. 27.260 decreased by 35% =
28. 28.630 increased by 10% =
29. 29.375 decreased by 8% =
30. 30.300 decreased by 60% =
31. 31.255 decreased by 60% =
32. 32.360 decreased by 15% =
33. 33.736 increased by 25% =
34. 34.660 decreased by 5% =
35. 35.510 decreased by 30% =
36. 36.560 decreased by 30% =
37. 37.640 increased by 15% =
38. 38.400 decreased by 60% =
39. 39.70 increased by 30% =
40. 40.700 decreased by 75% =

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