Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 371 · 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. 1.40 decreased by 5% =
2. 2.500 decreased by 15% =
3. 3.180 increased by 40% =
4. 4.280 decreased by 15% =
5. 5.60 increased by 5% =
6. 6.400 increased by 20% =
7. 7.720 increased by 15% =
8. 8.145 increased by 60% =
9. 9.700 decreased by 8% =
10. 10.604 decreased by 50% =
11. 11.500 decreased by 5% =
12. 12.775 increased by 12% =
13. 13.680 decreased by 15% =
14. 14.300 decreased by 35% =
15. 15.320 decreased by 35% =
16. 16.190 increased by 10% =
17. 17.582 increased by 50% =
18. 18.280 decreased by 15% =
19. 19.380 increased by 35% =
20. 20.80 decreased by 5% =
21. 21.45 decreased by 20% =
22. 22.145 increased by 60% =
23. 23.390 increased by 20% =
24. 24.740 decreased by 60% =
25. 25.660 increased by 35% =
26. 26.540 decreased by 40% =
27. 27.540 increased by 10% =
28. 28.310 increased by 20% =
29. 29.160 decreased by 5% =
30. 30.536 decreased by 75% =
31. 31.330 decreased by 60% =
32. 32.70 increased by 10% =
33. 33.618 decreased by 50% =
34. 34.425 increased by 12% =
35. 35.196 increased by 75% =
36. 36.650 decreased by 12% =
37. 37.408 decreased by 75% =
38. 38.612 increased by 25% =
39. 39.648 decreased by 25% =
40. 40.700 decreased by 20% =

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