Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 679 · 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. 1.340 decreased by 15% =
2. 2.660 increased by 50% =
3. 3.655 decreased by 20% =
4. 4.680 increased by 15% =
5. 5.740 increased by 5% =
6. 6.275 decreased by 12% =
7. 7.800 decreased by 12% =
8. 8.350 increased by 12% =
9. 9.315 increased by 20% =
10. 10.675 decreased by 8% =
11. 11.220 increased by 35% =
12. 12.700 increased by 40% =
13. 13.740 increased by 5% =
14. 14.600 increased by 12% =
15. 15.576 increased by 50% =
16. 16.228 increased by 25% =
17. 17.780 increased by 40% =
18. 18.288 increased by 25% =
19. 19.356 increased by 25% =
20. 20.268 increased by 50% =
21. 21.72 decreased by 25% =
22. 22.120 increased by 30% =
23. 23.420 decreased by 40% =
24. 24.320 increased by 15% =
25. 25.280 decreased by 15% =
26. 26.120 decreased by 30% =
27. 27.450 increased by 8% =
28. 28.618 decreased by 50% =
29. 29.160 increased by 25% =
30. 30.120 decreased by 10% =
31. 31.390 decreased by 30% =
32. 32.104 decreased by 75% =
33. 33.190 increased by 50% =
34. 34.120 increased by 15% =
35. 35.275 decreased by 12% =
36. 36.800 decreased by 5% =
37. 37.425 increased by 8% =
38. 38.422 decreased by 50% =
39. 39.375 decreased by 40% =
40. 40.280 decreased by 40% =

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