Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 815 · 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. 1.455 increased by 60% =
2. 2.248 increased by 50% =
3. 3.630 increased by 10% =
4. 4.220 decreased by 10% =
5. 5.80 increased by 15% =
6. 6.215 increased by 20% =
7. 7.415 decreased by 60% =
8. 8.170 decreased by 20% =
9. 9.75 increased by 40% =
10. 10.590 decreased by 10% =
11. 11.680 increased by 5% =
12. 12.230 increased by 20% =
13. 13.720 decreased by 15% =
14. 14.692 increased by 50% =
15. 15.290 increased by 30% =
16. 16.350 decreased by 40% =
17. 17.225 decreased by 8% =
18. 18.525 increased by 12% =
19. 19.760 decreased by 15% =
20. 20.290 increased by 40% =
21. 21.320 increased by 5% =
22. 22.420 increased by 30% =
23. 23.640 decreased by 75% =
24. 24.400 increased by 30% =
25. 25.300 decreased by 12% =
26. 26.405 increased by 60% =
27. 27.55 increased by 60% =
28. 28.520 decreased by 35% =
29. 29.220 increased by 25% =
30. 30.320 decreased by 15% =
31. 31.230 increased by 30% =
32. 32.75 decreased by 8% =
33. 33.440 increased by 10% =
34. 34.280 increased by 5% =
35. 35.130 increased by 10% =
36. 36.60 decreased by 30% =
37. 37.644 increased by 25% =
38. 38.40 increased by 10% =
39. 39.624 increased by 50% =
40. 40.705 increased by 20% =

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