Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 837 · 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. 1.245 increased by 60% =
2. 2.155 decreased by 20% =
3. 3.250 decreased by 8% =
4. 4.320 increased by 35% =
5. 5.610 increased by 10% =
6. 6.172 increased by 50% =
7. 7.95 decreased by 20% =
8. 8.640 increased by 35% =
9. 9.60 increased by 15% =
10. 10.252 decreased by 25% =
11. 11.380 decreased by 30% =
12. 12.790 increased by 10% =
13. 13.52 decreased by 25% =
14. 14.680 decreased by 35% =
15. 15.440 increased by 30% =
16. 16.80 increased by 35% =
17. 17.435 increased by 40% =
18. 18.480 decreased by 15% =
19. 19.270 increased by 40% =
20. 20.740 increased by 20% =
21. 21.500 decreased by 30% =
22. 22.400 increased by 20% =
23. 23.250 increased by 12% =
24. 24.800 increased by 8% =
25. 25.600 decreased by 15% =
26. 26.220 decreased by 10% =
27. 27.320 decreased by 15% =
28. 28.750 decreased by 8% =
29. 29.230 decreased by 60% =
30. 30.680 increased by 5% =
31. 31.500 increased by 12% =
32. 32.660 decreased by 5% =
33. 33.145 decreased by 40% =
34. 34.520 increased by 15% =
35. 35.280 decreased by 40% =
36. 36.668 decreased by 75% =
37. 37.360 increased by 10% =
38. 38.260 increased by 15% =
39. 39.776 increased by 75% =
40. 40.800 increased by 8% =

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