Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 980 · 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. 1.450 increased by 8% =
2. 2.492 decreased by 75% =
3. 3.755 increased by 60% =
4. 4.665 decreased by 20% =
5. 5.420 decreased by 15% =
6. 6.748 increased by 75% =
7. 7.140 increased by 30% =
8. 8.80 decreased by 15% =
9. 9.572 increased by 50% =
10. 10.502 decreased by 50% =
11. 11.580 increased by 10% =
12. 12.165 increased by 60% =
13. 13.428 increased by 25% =
14. 14.800 increased by 15% =
15. 15.104 increased by 25% =
16. 16.320 increased by 35% =
17. 17.170 increased by 30% =
18. 18.600 increased by 5% =
19. 19.360 decreased by 15% =
20. 20.76 increased by 25% =
21. 21.450 increased by 12% =
22. 22.500 increased by 5% =
23. 23.225 increased by 8% =
24. 24.570 decreased by 30% =
25. 25.640 increased by 10% =
26. 26.595 decreased by 60% =
27. 27.400 increased by 20% =
28. 28.664 increased by 50% =
29. 29.565 decreased by 20% =
30. 30.680 increased by 40% =
31. 31.625 decreased by 60% =
32. 32.475 increased by 12% =
33. 33.580 increased by 5% =
34. 34.622 increased by 50% =
35. 35.340 increased by 5% =
36. 36.700 decreased by 30% =
37. 37.600 increased by 12% =
38. 38.560 decreased by 20% =
39. 39.420 decreased by 60% =
40. 40.715 decreased by 40% =

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