Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 240 · 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. 1.175 decreased by 8% =
2. 2.740 decreased by 30% =
3. 3.140 increased by 10% =
4. 4.580 decreased by 50% =
5. 5.504 decreased by 50% =
6. 6.125 decreased by 40% =
7. 7.340 increased by 40% =
8. 8.75 decreased by 12% =
9. 9.105 decreased by 60% =
10. 10.170 increased by 30% =
11. 11.220 decreased by 25% =
12. 12.230 decreased by 60% =
13. 13.80 increased by 30% =
14. 14.420 decreased by 75% =
15. 15.340 decreased by 15% =
16. 16.140 increased by 15% =
17. 17.135 decreased by 40% =
18. 18.80 increased by 75% =
19. 19.145 increased by 60% =
20. 20.395 increased by 40% =
21. 21.480 decreased by 35% =
22. 22.300 decreased by 15% =
23. 23.710 decreased by 20% =
24. 24.525 decreased by 12% =
25. 25.300 increased by 12% =
26. 26.280 increased by 30% =
27. 27.720 increased by 5% =
28. 28.560 increased by 60% =
29. 29.545 increased by 20% =
30. 30.710 decreased by 20% =
31. 31.60 decreased by 10% =
32. 32.220 decreased by 15% =
33. 33.255 increased by 40% =
34. 34.560 increased by 30% =
35. 35.180 increased by 15% =
36. 36.305 decreased by 20% =
37. 37.60 increased by 15% =
38. 38.130 increased by 30% =
39. 39.692 decreased by 50% =
40. 40.460 increased by 10% =

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