Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 599 · 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. 1.620 increased by 5% =
2. 2.480 increased by 5% =
3. 3.330 decreased by 30% =
4. 4.410 increased by 50% =
5. 5.660 increased by 5% =
6. 6.345 increased by 60% =
7. 7.250 increased by 12% =
8. 8.180 increased by 35% =
9. 9.452 increased by 75% =
10. 10.125 decreased by 60% =
11. 11.780 increased by 75% =
12. 12.400 increased by 15% =
13. 13.130 increased by 30% =
14. 14.220 increased by 15% =
15. 15.304 increased by 75% =
16. 16.660 increased by 35% =
17. 17.255 decreased by 20% =
18. 18.240 decreased by 35% =
19. 19.318 increased by 50% =
20. 20.420 increased by 15% =
21. 21.370 increased by 10% =
22. 22.800 increased by 12% =
23. 23.680 decreased by 10% =
24. 24.340 increased by 30% =
25. 25.788 decreased by 25% =
26. 26.100 decreased by 10% =
27. 27.280 increased by 5% =
28. 28.740 increased by 5% =
29. 29.220 decreased by 35% =
30. 30.325 decreased by 60% =
31. 31.760 decreased by 15% =
32. 32.80 decreased by 30% =
33. 33.760 decreased by 5% =
34. 34.100 increased by 5% =
35. 35.420 increased by 35% =
36. 36.445 decreased by 40% =
37. 37.220 decreased by 30% =
38. 38.360 decreased by 10% =
39. 39.100 decreased by 35% =
40. 40.86 decreased by 50% =

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