Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 734 · 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. 1.560 decreased by 75% =
2. 2.150 increased by 8% =
3. 3.440 decreased by 5% =
4. 4.210 decreased by 10% =
5. 5.50 decreased by 8% =
6. 6.425 decreased by 12% =
7. 7.280 increased by 40% =
8. 8.216 decreased by 25% =
9. 9.125 decreased by 12% =
10. 10.506 decreased by 50% =
11. 11.244 decreased by 25% =
12. 12.600 decreased by 5% =
13. 13.620 increased by 10% =
14. 14.55 decreased by 60% =
15. 15.775 decreased by 12% =
16. 16.52 increased by 50% =
17. 17.680 increased by 75% =
18. 18.340 decreased by 5% =
19. 19.60 decreased by 15% =
20. 20.400 increased by 30% =
21. 21.660 decreased by 50% =
22. 22.775 decreased by 8% =
23. 23.520 decreased by 15% =
24. 24.760 increased by 30% =
25. 25.775 increased by 8% =
26. 26.340 decreased by 30% =
27. 27.366 increased by 50% =
28. 28.255 increased by 20% =
29. 29.680 decreased by 5% =
30. 30.780 decreased by 5% =
31. 31.520 decreased by 10% =
32. 32.250 increased by 8% =
33. 33.160 increased by 35% =
34. 34.295 increased by 60% =
35. 35.550 increased by 30% =
36. 36.114 decreased by 50% =
37. 37.480 decreased by 15% =
38. 38.760 increased by 10% =
39. 39.700 decreased by 8% =
40. 40.768 decreased by 75% =

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