Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 242 · 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. 1.708 increased by 75% =
2. 2.580 increased by 15% =
3. 3.50 decreased by 20% =
4. 4.275 decreased by 60% =
5. 5.40 increased by 40% =
6. 6.340 increased by 10% =
7. 7.388 decreased by 75% =
8. 8.160 increased by 40% =
9. 9.530 increased by 60% =
10. 10.800 increased by 35% =
11. 11.556 decreased by 75% =
12. 12.320 increased by 5% =
13. 13.240 decreased by 20% =
14. 14.60 decreased by 75% =
15. 15.180 increased by 25% =
16. 16.540 decreased by 15% =
17. 17.770 increased by 10% =
18. 18.715 decreased by 20% =
19. 19.460 increased by 35% =
20. 20.264 decreased by 75% =
21. 21.300 increased by 20% =
22. 22.244 increased by 75% =
23. 23.50 increased by 8% =
24. 24.644 decreased by 50% =
25. 25.700 increased by 30% =
26. 26.700 increased by 8% =
27. 27.800 decreased by 35% =
28. 28.362 decreased by 50% =
29. 29.578 decreased by 50% =
30. 30.130 decreased by 30% =
31. 31.232 increased by 50% =
32. 32.380 decreased by 10% =
33. 33.715 decreased by 40% =
34. 34.655 increased by 20% =
35. 35.300 increased by 60% =
36. 36.450 decreased by 8% =
37. 37.670 decreased by 30% =
38. 38.720 increased by 10% =
39. 39.440 increased by 35% =
40. 40.700 decreased by 12% =

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