Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 314 · 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. 1.520 increased by 15% =
2. 2.555 increased by 60% =
3. 3.240 increased by 5% =
4. 4.400 decreased by 35% =
5. 5.175 increased by 40% =
6. 6.335 decreased by 20% =
7. 7.334 decreased by 50% =
8. 8.640 decreased by 20% =
9. 9.800 decreased by 35% =
10. 10.120 decreased by 15% =
11. 11.304 decreased by 25% =
12. 12.440 decreased by 20% =
13. 13.520 decreased by 15% =
14. 14.700 increased by 30% =
15. 15.412 decreased by 25% =
16. 16.675 increased by 12% =
17. 17.740 decreased by 15% =
18. 18.104 decreased by 25% =
19. 19.395 increased by 20% =
20. 20.570 increased by 40% =
21. 21.515 increased by 40% =
22. 22.78 increased by 50% =
23. 23.750 increased by 12% =
24. 24.636 decreased by 50% =
25. 25.280 increased by 30% =
26. 26.575 increased by 12% =
27. 27.144 decreased by 25% =
28. 28.160 increased by 5% =
29. 29.100 decreased by 5% =
30. 30.50 increased by 30% =
31. 31.372 increased by 25% =
32. 32.705 increased by 60% =
33. 33.340 increased by 5% =
34. 34.460 decreased by 40% =
35. 35.440 increased by 35% =
36. 36.254 increased by 50% =
37. 37.520 decreased by 15% =
38. 38.650 increased by 10% =
39. 39.655 decreased by 60% =
40. 40.780 increased by 5% =

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