Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 705 · 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. 1.44 decreased by 75% =
2. 2.370 increased by 30% =
3. 3.405 decreased by 40% =
4. 4.570 increased by 50% =
5. 5.580 decreased by 15% =
6. 6.475 increased by 12% =
7. 7.225 decreased by 8% =
8. 8.525 increased by 8% =
9. 9.608 increased by 75% =
10. 10.520 decreased by 30% =
11. 11.375 decreased by 12% =
12. 12.616 decreased by 75% =
13. 13.160 decreased by 30% =
14. 14.390 decreased by 10% =
15. 15.260 decreased by 10% =
16. 16.360 decreased by 30% =
17. 17.80 increased by 15% =
18. 18.480 decreased by 35% =
19. 19.628 increased by 25% =
20. 20.185 increased by 20% =
21. 21.470 increased by 30% =
22. 22.160 decreased by 15% =
23. 23.160 increased by 30% =
24. 24.245 increased by 20% =
25. 25.604 increased by 50% =
26. 26.455 decreased by 40% =
27. 27.772 increased by 25% =
28. 28.150 increased by 30% =
29. 29.220 increased by 15% =
30. 30.512 decreased by 50% =
31. 31.390 decreased by 50% =
32. 32.80 increased by 20% =
33. 33.40 increased by 10% =
34. 34.590 decreased by 10% =
35. 35.475 increased by 40% =
36. 36.390 decreased by 10% =
37. 37.225 decreased by 60% =
38. 38.345 decreased by 60% =
39. 39.310 decreased by 10% =
40. 40.680 increased by 15% =

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