Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 800 · 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. 1.140 increased by 30% =
2. 2.280 decreased by 35% =
3. 3.200 increased by 5% =
4. 4.640 increased by 20% =
5. 5.160 increased by 20% =
6. 6.100 decreased by 60% =
7. 7.745 decreased by 20% =
8. 8.325 decreased by 60% =
9. 9.790 increased by 10% =
10. 10.250 increased by 40% =
11. 11.460 increased by 30% =
12. 12.100 increased by 10% =
13. 13.290 decreased by 50% =
14. 14.770 increased by 10% =
15. 15.700 increased by 5% =
16. 16.425 decreased by 8% =
17. 17.100 decreased by 8% =
18. 18.490 decreased by 40% =
19. 19.392 decreased by 25% =
20. 20.340 increased by 35% =
21. 21.708 increased by 25% =
22. 22.700 decreased by 8% =
23. 23.220 increased by 15% =
24. 24.125 decreased by 12% =
25. 25.305 decreased by 40% =
26. 26.448 increased by 25% =
27. 27.780 decreased by 35% =
28. 28.400 increased by 40% =
29. 29.665 increased by 60% =
30. 30.380 decreased by 75% =
31. 31.325 increased by 8% =
32. 32.225 increased by 12% =
33. 33.175 decreased by 40% =
34. 34.428 decreased by 75% =
35. 35.100 increased by 8% =
36. 36.300 increased by 50% =
37. 37.350 decreased by 40% =
38. 38.60 increased by 10% =
39. 39.492 decreased by 25% =
40. 40.72 increased by 50% =

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