Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 672 · 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. 1.496 increased by 50% =
2. 2.175 increased by 8% =
3. 3.140 decreased by 20% =
4. 4.704 decreased by 75% =
5. 5.685 increased by 20% =
6. 6.72 decreased by 25% =
7. 7.420 increased by 50% =
8. 8.700 decreased by 15% =
9. 9.524 increased by 75% =
10. 10.740 decreased by 10% =
11. 11.320 decreased by 10% =
12. 12.340 decreased by 35% =
13. 13.80 increased by 35% =
14. 14.128 decreased by 75% =
15. 15.165 increased by 60% =
16. 16.640 increased by 15% =
17. 17.400 increased by 5% =
18. 18.360 increased by 15% =
19. 19.580 decreased by 10% =
20. 20.464 decreased by 50% =
21. 21.780 decreased by 5% =
22. 22.456 decreased by 50% =
23. 23.534 increased by 50% =
24. 24.505 increased by 40% =
25. 25.800 increased by 5% =
26. 26.380 decreased by 30% =
27. 27.40 decreased by 15% =
28. 28.100 increased by 25% =
29. 29.45 increased by 60% =
30. 30.450 increased by 12% =
31. 31.310 decreased by 30% =
32. 32.80 decreased by 5% =
33. 33.760 decreased by 35% =
34. 34.800 decreased by 30% =
35. 35.490 decreased by 10% =
36. 36.220 decreased by 15% =
37. 37.500 decreased by 35% =
38. 38.710 increased by 20% =
39. 39.332 decreased by 75% =
40. 40.610 increased by 50% =

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