Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 319 · 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. 1.576 increased by 50% =
2. 2.640 increased by 15% =
3. 3.265 decreased by 20% =
4. 4.250 increased by 30% =
5. 5.175 decreased by 60% =
6. 6.140 increased by 15% =
7. 7.80 decreased by 25% =
8. 8.552 increased by 25% =
9. 9.410 increased by 30% =
10. 10.310 decreased by 30% =
11. 11.324 increased by 25% =
12. 12.40 decreased by 15% =
13. 13.460 increased by 15% =
14. 14.700 decreased by 8% =
15. 15.528 decreased by 75% =
16. 16.665 increased by 60% =
17. 17.50 increased by 8% =
18. 18.800 increased by 35% =
19. 19.245 increased by 20% =
20. 20.55 increased by 60% =
21. 21.625 increased by 12% =
22. 22.745 increased by 20% =
23. 23.340 increased by 15% =
24. 24.300 increased by 5% =
25. 25.790 increased by 40% =
26. 26.450 decreased by 8% =
27. 27.440 increased by 40% =
28. 28.230 decreased by 10% =
29. 29.635 increased by 40% =
30. 30.75 increased by 12% =
31. 31.425 increased by 12% =
32. 32.75 increased by 12% =
33. 33.138 increased by 50% =
34. 34.660 decreased by 40% =
35. 35.664 decreased by 75% =
36. 36.276 increased by 25% =
37. 37.390 increased by 30% =
38. 38.350 increased by 10% =
39. 39.320 decreased by 15% =
40. 40.300 decreased by 30% =

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