Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 24 · 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. 1.535 increased by 40% =
2. 2.240 increased by 15% =
3. 3.80 decreased by 5% =
4. 4.280 increased by 30% =
5. 5.690 decreased by 20% =
6. 6.50 decreased by 10% =
7. 7.550 increased by 8% =
8. 8.706 decreased by 50% =
9. 9.280 decreased by 15% =
10. 10.700 increased by 15% =
11. 11.370 increased by 10% =
12. 12.350 decreased by 12% =
13. 13.650 increased by 30% =
14. 14.140 increased by 35% =
15. 15.116 decreased by 75% =
16. 16.325 increased by 12% =
17. 17.720 increased by 35% =
18. 18.180 increased by 25% =
19. 19.310 decreased by 20% =
20. 20.420 decreased by 20% =
21. 21.225 decreased by 8% =
22. 22.780 decreased by 15% =
23. 23.550 increased by 20% =
24. 24.710 decreased by 40% =
25. 25.676 decreased by 50% =
26. 26.340 decreased by 20% =
27. 27.660 increased by 10% =
28. 28.665 increased by 20% =
29. 29.430 decreased by 50% =
30. 30.725 decreased by 8% =
31. 31.460 increased by 5% =
32. 32.360 increased by 15% =
33. 33.655 decreased by 20% =
34. 34.390 decreased by 30% =
35. 35.320 decreased by 25% =
36. 36.675 decreased by 12% =
37. 37.160 decreased by 15% =
38. 38.496 increased by 25% =
39. 39.764 increased by 25% =
40. 40.425 increased by 12% =

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