Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 716 · 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. 1.550 decreased by 20% =
2. 2.180 decreased by 15% =
3. 3.555 increased by 40% =
4. 4.40 increased by 40% =
5. 5.725 decreased by 8% =
6. 6.45 increased by 40% =
7. 7.320 decreased by 5% =
8. 8.265 decreased by 40% =
9. 9.230 decreased by 30% =
10. 10.750 increased by 8% =
11. 11.100 increased by 5% =
12. 12.716 decreased by 25% =
13. 13.105 increased by 40% =
14. 14.440 decreased by 15% =
15. 15.800 decreased by 10% =
16. 16.400 increased by 12% =
17. 17.340 decreased by 35% =
18. 18.160 increased by 30% =
19. 19.644 decreased by 75% =
20. 20.360 increased by 15% =
21. 21.88 increased by 25% =
22. 22.160 decreased by 10% =
23. 23.572 decreased by 25% =
24. 24.40 increased by 15% =
25. 25.175 decreased by 12% =
26. 26.640 decreased by 5% =
27. 27.640 decreased by 15% =
28. 28.475 increased by 40% =
29. 29.748 increased by 50% =
30. 30.640 increased by 10% =
31. 31.240 decreased by 5% =
32. 32.600 decreased by 60% =
33. 33.500 increased by 5% =
34. 34.420 decreased by 10% =
35. 35.104 increased by 25% =
36. 36.710 decreased by 10% =
37. 37.365 decreased by 60% =
38. 38.450 increased by 12% =
39. 39.672 decreased by 25% =
40. 40.620 increased by 30% =

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