Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 825 · 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. 1.315 increased by 20% =
2. 2.780 increased by 5% =
3. 3.700 decreased by 10% =
4. 4.775 decreased by 8% =
5. 5.784 decreased by 75% =
6. 6.380 increased by 20% =
7. 7.564 decreased by 75% =
8. 8.580 decreased by 50% =
9. 9.86 decreased by 50% =
10. 10.60 increased by 5% =
11. 11.650 decreased by 10% =
12. 12.155 increased by 60% =
13. 13.300 decreased by 15% =
14. 14.110 decreased by 60% =
15. 15.720 decreased by 35% =
16. 16.240 decreased by 10% =
17. 17.660 decreased by 15% =
18. 18.450 increased by 8% =
19. 19.80 increased by 15% =
20. 20.252 decreased by 75% =
21. 21.128 decreased by 75% =
22. 22.620 decreased by 5% =
23. 23.475 decreased by 20% =
24. 24.230 increased by 30% =
25. 25.200 decreased by 35% =
26. 26.380 decreased by 75% =
27. 27.600 decreased by 5% =
28. 28.105 decreased by 40% =
29. 29.372 decreased by 25% =
30. 30.340 increased by 35% =
31. 31.375 increased by 12% =
32. 32.450 increased by 10% =
33. 33.180 increased by 25% =
34. 34.100 decreased by 5% =
35. 35.575 decreased by 40% =
36. 36.755 increased by 60% =
37. 37.640 increased by 35% =
38. 38.320 increased by 20% =
39. 39.700 increased by 5% =
40. 40.350 decreased by 20% =

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