Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 524 · 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. 1.100 increased by 5% =
2. 2.616 decreased by 25% =
3. 3.420 decreased by 10% =
4. 4.555 increased by 40% =
5. 5.120 decreased by 25% =
6. 6.440 decreased by 35% =
7. 7.150 increased by 10% =
8. 8.400 decreased by 8% =
9. 9.96 decreased by 25% =
10. 10.175 increased by 8% =
11. 11.310 increased by 40% =
12. 12.770 increased by 10% =
13. 13.310 increased by 30% =
14. 14.760 increased by 15% =
15. 15.472 increased by 25% =
16. 16.434 increased by 50% =
17. 17.198 increased by 50% =
18. 18.220 decreased by 10% =
19. 19.300 increased by 25% =
20. 20.515 decreased by 40% =
21. 21.106 decreased by 50% =
22. 22.530 increased by 10% =
23. 23.125 decreased by 12% =
24. 24.640 decreased by 20% =
25. 25.125 increased by 12% =
26. 26.300 decreased by 12% =
27. 27.340 decreased by 10% =
28. 28.180 decreased by 75% =
29. 29.270 decreased by 10% =
30. 30.292 increased by 25% =
31. 31.125 decreased by 8% =
32. 32.592 decreased by 50% =
33. 33.160 increased by 40% =
34. 34.360 increased by 30% =
35. 35.180 decreased by 5% =
36. 36.250 increased by 40% =
37. 37.76 increased by 75% =
38. 38.390 increased by 40% =
39. 39.88 increased by 75% =
40. 40.500 increased by 8% =

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