Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 565 · 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. 1.530 decreased by 10% =
2. 2.780 increased by 35% =
3. 3.580 decreased by 5% =
4. 4.350 increased by 8% =
5. 5.188 decreased by 75% =
6. 6.220 decreased by 5% =
7. 7.180 decreased by 5% =
8. 8.484 decreased by 50% =
9. 9.50 decreased by 12% =
10. 10.208 decreased by 75% =
11. 11.245 increased by 40% =
12. 12.340 decreased by 5% =
13. 13.340 decreased by 15% =
14. 14.480 increased by 5% =
15. 15.560 increased by 5% =
16. 16.750 decreased by 12% =
17. 17.204 decreased by 25% =
18. 18.564 increased by 25% =
19. 19.360 decreased by 5% =
20. 20.150 increased by 12% =
21. 21.140 decreased by 10% =
22. 22.280 decreased by 5% =
23. 23.630 decreased by 60% =
24. 24.715 increased by 60% =
25. 25.600 decreased by 35% =
26. 26.200 decreased by 35% =
27. 27.400 increased by 10% =
28. 28.268 decreased by 50% =
29. 29.108 decreased by 25% =
30. 30.540 decreased by 15% =
31. 31.300 decreased by 75% =
32. 32.215 increased by 60% =
33. 33.700 decreased by 8% =
34. 34.660 increased by 15% =
35. 35.400 decreased by 35% =
36. 36.60 increased by 5% =
37. 37.750 increased by 10% =
38. 38.225 decreased by 12% =
39. 39.610 decreased by 10% =
40. 40.100 increased by 60% =

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