Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 483 · 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. 1.75 decreased by 12% =
2. 2.436 increased by 50% =
3. 3.248 increased by 50% =
4. 4.320 increased by 60% =
5. 5.685 decreased by 60% =
6. 6.156 increased by 75% =
7. 7.315 increased by 20% =
8. 8.790 decreased by 10% =
9. 9.336 increased by 75% =
10. 10.335 increased by 20% =
11. 11.660 increased by 35% =
12. 12.352 increased by 50% =
13. 13.664 increased by 75% =
14. 14.440 decreased by 5% =
15. 15.48 increased by 25% =
16. 16.600 decreased by 5% =
17. 17.560 decreased by 75% =
18. 18.210 decreased by 10% =
19. 19.370 increased by 30% =
20. 20.130 increased by 10% =
21. 21.116 increased by 75% =
22. 22.180 increased by 5% =
23. 23.360 increased by 40% =
24. 24.244 increased by 50% =
25. 25.98 decreased by 50% =
26. 26.50 increased by 20% =
27. 27.768 decreased by 75% =
28. 28.650 decreased by 10% =
29. 29.360 increased by 10% =
30. 30.710 decreased by 10% =
31. 31.120 increased by 5% =
32. 32.760 increased by 15% =
33. 33.120 increased by 35% =
34. 34.90 increased by 10% =
35. 35.100 decreased by 35% =
36. 36.100 increased by 15% =
37. 37.280 decreased by 5% =
38. 38.120 decreased by 15% =
39. 39.350 decreased by 8% =
40. 40.780 increased by 35% =

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