Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 785 · 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. 1.60 increased by 25% =
2. 2.780 decreased by 5% =
3. 3.635 decreased by 60% =
4. 4.440 increased by 15% =
5. 5.330 decreased by 40% =
6. 6.370 decreased by 10% =
7. 7.690 increased by 50% =
8. 8.612 decreased by 25% =
9. 9.60 increased by 35% =
10. 10.65 decreased by 40% =
11. 11.108 decreased by 25% =
12. 12.620 decreased by 35% =
13. 13.150 decreased by 12% =
14. 14.495 decreased by 20% =
15. 15.495 decreased by 60% =
16. 16.720 decreased by 35% =
17. 17.388 increased by 75% =
18. 18.700 increased by 15% =
19. 19.740 increased by 35% =
20. 20.690 decreased by 10% =
21. 21.700 increased by 8% =
22. 22.280 increased by 35% =
23. 23.310 increased by 20% =
24. 24.50 decreased by 12% =
25. 25.200 decreased by 8% =
26. 26.90 decreased by 30% =
27. 27.480 decreased by 15% =
28. 28.250 increased by 20% =
29. 29.410 increased by 40% =
30. 30.780 decreased by 5% =
31. 31.450 decreased by 30% =
32. 32.580 decreased by 35% =
33. 33.380 increased by 75% =
34. 34.624 increased by 25% =
35. 35.520 decreased by 5% =
36. 36.655 increased by 20% =
37. 37.800 decreased by 5% =
38. 38.260 increased by 35% =
39. 39.375 increased by 12% =
40. 40.240 decreased by 5% =

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