Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 780 · 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. 1.60 decreased by 30% =
2. 2.630 increased by 40% =
3. 3.530 increased by 20% =
4. 4.770 increased by 50% =
5. 5.172 decreased by 75% =
6. 6.640 decreased by 25% =
7. 7.80 increased by 5% =
8. 8.750 decreased by 40% =
9. 9.470 decreased by 10% =
10. 10.100 decreased by 5% =
11. 11.175 decreased by 8% =
12. 12.380 increased by 15% =
13. 13.572 increased by 25% =
14. 14.310 decreased by 60% =
15. 15.400 decreased by 8% =
16. 16.675 increased by 12% =
17. 17.240 increased by 60% =
18. 18.160 increased by 35% =
19. 19.525 decreased by 8% =
20. 20.70 increased by 60% =
21. 21.775 decreased by 12% =
22. 22.730 increased by 20% =
23. 23.330 decreased by 30% =
24. 24.80 decreased by 35% =
25. 25.750 increased by 8% =
26. 26.475 decreased by 12% =
27. 27.280 decreased by 5% =
28. 28.180 decreased by 40% =
29. 29.550 decreased by 12% =
30. 30.275 increased by 8% =
31. 31.70 increased by 30% =
32. 32.195 increased by 40% =
33. 33.500 decreased by 8% =
34. 34.340 increased by 40% =
35. 35.775 decreased by 12% =
36. 36.380 increased by 35% =
37. 37.590 decreased by 20% =
38. 38.450 increased by 8% =
39. 39.360 increased by 15% =
40. 40.100 decreased by 10% =

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