Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 997 · 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 increased by 15% =
2. 2.600 increased by 12% =
3. 3.100 increased by 12% =
4. 4.510 increased by 50% =
5. 5.320 increased by 35% =
6. 6.425 decreased by 12% =
7. 7.380 decreased by 5% =
8. 8.500 increased by 60% =
9. 9.750 decreased by 8% =
10. 10.60 increased by 35% =
11. 11.330 decreased by 30% =
12. 12.50 increased by 12% =
13. 13.210 increased by 30% =
14. 14.614 increased by 50% =
15. 15.420 increased by 35% =
16. 16.380 decreased by 35% =
17. 17.135 decreased by 40% =
18. 18.220 increased by 35% =
19. 19.605 increased by 20% =
20. 20.150 decreased by 10% =
21. 21.100 decreased by 8% =
22. 22.180 decreased by 35% =
23. 23.140 decreased by 30% =
24. 24.315 decreased by 20% =
25. 25.684 decreased by 25% =
26. 26.510 decreased by 10% =
27. 27.525 increased by 12% =
28. 28.620 increased by 60% =
29. 29.220 increased by 75% =
30. 30.425 increased by 8% =
31. 31.300 decreased by 5% =
32. 32.590 increased by 20% =
33. 33.520 increased by 10% =
34. 34.620 increased by 30% =
35. 35.260 decreased by 30% =
36. 36.280 increased by 35% =
37. 37.560 decreased by 15% =
38. 38.400 increased by 15% =
39. 39.45 increased by 60% =
40. 40.64 decreased by 75% =

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