Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 799 · 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. 1.280 decreased by 60% =
2. 2.580 decreased by 35% =
3. 3.690 decreased by 20% =
4. 4.455 increased by 20% =
5. 5.465 decreased by 40% =
6. 6.40 decreased by 10% =
7. 7.120 increased by 10% =
8. 8.520 decreased by 75% =
9. 9.60 decreased by 35% =
10. 10.85 decreased by 60% =
11. 11.345 decreased by 60% =
12. 12.160 increased by 40% =
13. 13.380 decreased by 35% =
14. 14.300 decreased by 10% =
15. 15.630 decreased by 10% =
16. 16.150 decreased by 8% =
17. 17.570 decreased by 30% =
18. 18.50 increased by 8% =
19. 19.505 increased by 60% =
20. 20.540 decreased by 60% =
21. 21.412 increased by 50% =
22. 22.260 increased by 35% =
23. 23.92 increased by 25% =
24. 24.115 decreased by 60% =
25. 25.430 decreased by 10% =
26. 26.276 increased by 25% =
27. 27.620 decreased by 20% =
28. 28.548 increased by 75% =
29. 29.75 increased by 8% =
30. 30.390 decreased by 50% =
31. 31.360 decreased by 5% =
32. 32.396 decreased by 25% =
33. 33.475 decreased by 20% =
34. 34.75 increased by 12% =
35. 35.100 increased by 60% =
36. 36.480 increased by 35% =
37. 37.660 decreased by 5% =
38. 38.520 decreased by 15% =
39. 39.150 increased by 30% =
40. 40.420 increased by 5% =

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