Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 416 · 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. 1.165 increased by 40% =
2. 2.550 increased by 10% =
3. 3.395 increased by 60% =
4. 4.60 decreased by 15% =
5. 5.510 decreased by 40% =
6. 6.510 increased by 40% =
7. 7.150 decreased by 40% =
8. 8.790 decreased by 10% =
9. 9.155 increased by 20% =
10. 10.290 decreased by 60% =
11. 11.100 decreased by 5% =
12. 12.120 decreased by 15% =
13. 13.120 increased by 20% =
14. 14.45 decreased by 20% =
15. 15.530 decreased by 10% =
16. 16.460 decreased by 75% =
17. 17.495 increased by 40% =
18. 18.608 increased by 75% =
19. 19.140 increased by 20% =
20. 20.510 decreased by 10% =
21. 21.65 increased by 40% =
22. 22.75 increased by 40% =
23. 23.500 decreased by 5% =
24. 24.60 decreased by 50% =
25. 25.760 increased by 15% =
26. 26.500 decreased by 12% =
27. 27.120 decreased by 35% =
28. 28.122 increased by 50% =
29. 29.345 increased by 40% =
30. 30.710 increased by 60% =
31. 31.550 increased by 60% =
32. 32.795 increased by 60% =
33. 33.275 decreased by 12% =
34. 34.340 increased by 15% =
35. 35.616 increased by 75% =
36. 36.80 increased by 60% =
37. 37.100 decreased by 35% =
38. 38.435 decreased by 20% =
39. 39.760 increased by 5% =
40. 40.680 increased by 15% =

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