Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 638 · 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. 1.150 increased by 40% =
2. 2.200 increased by 8% =
3. 3.798 increased by 50% =
4. 4.375 increased by 20% =
5. 5.185 increased by 60% =
6. 6.70 decreased by 30% =
7. 7.64 increased by 25% =
8. 8.550 decreased by 12% =
9. 9.85 decreased by 20% =
10. 10.665 decreased by 40% =
11. 11.716 decreased by 75% =
12. 12.395 increased by 20% =
13. 13.725 decreased by 8% =
14. 14.620 increased by 35% =
15. 15.180 decreased by 15% =
16. 16.355 increased by 60% =
17. 17.450 decreased by 8% =
18. 18.220 decreased by 20% =
19. 19.50 increased by 8% =
20. 20.100 increased by 8% =
21. 21.800 decreased by 35% =
22. 22.550 increased by 12% =
23. 23.240 decreased by 5% =
24. 24.245 increased by 40% =
25. 25.344 decreased by 50% =
26. 26.556 increased by 25% =
27. 27.750 decreased by 8% =
28. 28.200 increased by 12% =
29. 29.220 decreased by 15% =
30. 30.252 increased by 25% =
31. 31.700 increased by 12% =
32. 32.700 increased by 30% =
33. 33.752 increased by 75% =
34. 34.475 increased by 12% =
35. 35.590 decreased by 10% =
36. 36.288 increased by 75% =
37. 37.415 increased by 40% =
38. 38.200 decreased by 10% =
39. 39.215 decreased by 40% =
40. 40.375 decreased by 12% =

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