Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 479 · 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. 1.680 increased by 10% =
2. 2.695 increased by 20% =
3. 3.552 decreased by 25% =
4. 4.700 increased by 12% =
5. 5.136 increased by 50% =
6. 6.800 decreased by 35% =
7. 7.492 increased by 25% =
8. 8.210 increased by 60% =
9. 9.130 increased by 40% =
10. 10.444 increased by 75% =
11. 11.284 decreased by 50% =
12. 12.325 increased by 12% =
13. 13.525 increased by 8% =
14. 14.80 decreased by 75% =
15. 15.456 decreased by 25% =
16. 16.120 decreased by 35% =
17. 17.300 decreased by 35% =
18. 18.540 increased by 10% =
19. 19.204 increased by 50% =
20. 20.550 increased by 12% =
21. 21.250 decreased by 8% =
22. 22.490 increased by 10% =
23. 23.360 increased by 50% =
24. 24.232 decreased by 25% =
25. 25.660 increased by 35% =
26. 26.395 decreased by 20% =
27. 27.700 increased by 35% =
28. 28.270 increased by 10% =
29. 29.260 increased by 10% =
30. 30.425 increased by 40% =
31. 31.274 increased by 50% =
32. 32.620 decreased by 5% =
33. 33.645 decreased by 40% =
34. 34.720 decreased by 35% =
35. 35.320 decreased by 5% =
36. 36.240 increased by 25% =
37. 37.80 decreased by 35% =
38. 38.52 decreased by 25% =
39. 39.676 decreased by 75% =
40. 40.295 decreased by 60% =

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