Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 485 · 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. 1.220 increased by 30% =
2. 2.100 increased by 25% =
3. 3.240 increased by 15% =
4. 4.404 increased by 75% =
5. 5.472 decreased by 50% =
6. 6.672 decreased by 25% =
7. 7.336 increased by 25% =
8. 8.65 decreased by 40% =
9. 9.400 increased by 8% =
10. 10.350 increased by 10% =
11. 11.675 decreased by 12% =
12. 12.145 increased by 40% =
13. 13.602 increased by 50% =
14. 14.375 increased by 8% =
15. 15.650 increased by 12% =
16. 16.700 increased by 12% =
17. 17.90 decreased by 30% =
18. 18.760 increased by 60% =
19. 19.525 decreased by 12% =
20. 20.175 decreased by 12% =
21. 21.720 decreased by 60% =
22. 22.650 decreased by 8% =
23. 23.720 decreased by 35% =
24. 24.270 decreased by 20% =
25. 25.300 increased by 5% =
26. 26.670 decreased by 40% =
27. 27.190 decreased by 10% =
28. 28.452 increased by 50% =
29. 29.676 decreased by 50% =
30. 30.348 increased by 25% =
31. 31.360 increased by 10% =
32. 32.60 decreased by 30% =
33. 33.140 decreased by 5% =
34. 34.55 decreased by 60% =
35. 35.780 decreased by 10% =
36. 36.325 decreased by 8% =
37. 37.700 increased by 15% =
38. 38.210 decreased by 10% =
39. 39.68 increased by 50% =
40. 40.440 increased by 35% =

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