Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 163 · 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. 1.90 increased by 40% =
2. 2.675 increased by 60% =
3. 3.700 decreased by 12% =
4. 4.790 increased by 20% =
5. 5.530 increased by 60% =
6. 6.740 increased by 30% =
7. 7.300 decreased by 8% =
8. 8.650 increased by 30% =
9. 9.296 decreased by 25% =
10. 10.500 decreased by 35% =
11. 11.400 decreased by 30% =
12. 12.110 decreased by 40% =
13. 13.300 decreased by 75% =
14. 14.80 decreased by 5% =
15. 15.750 increased by 40% =
16. 16.400 increased by 30% =
17. 17.228 decreased by 25% =
18. 18.558 decreased by 50% =
19. 19.772 increased by 75% =
20. 20.425 decreased by 12% =
21. 21.525 increased by 8% =
22. 22.350 decreased by 30% =
23. 23.426 decreased by 50% =
24. 24.525 decreased by 8% =
25. 25.800 decreased by 8% =
26. 26.260 increased by 5% =
27. 27.680 increased by 50% =
28. 28.200 increased by 5% =
29. 29.200 increased by 10% =
30. 30.80 decreased by 15% =
31. 31.92 decreased by 25% =
32. 32.215 decreased by 60% =
33. 33.740 increased by 10% =
34. 34.300 increased by 5% =
35. 35.405 decreased by 20% =
36. 36.260 decreased by 75% =
37. 37.252 increased by 75% =
38. 38.640 increased by 35% =
39. 39.760 decreased by 35% =
40. 40.588 decreased by 25% =

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