Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 887 · 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. 1.330 increased by 20% =
2. 2.500 increased by 5% =
3. 3.456 increased by 75% =
4. 4.95 decreased by 60% =
5. 5.722 increased by 50% =
6. 6.700 increased by 15% =
7. 7.710 increased by 30% =
8. 8.220 increased by 5% =
9. 9.450 increased by 12% =
10. 10.700 decreased by 12% =
11. 11.735 increased by 20% =
12. 12.360 decreased by 50% =
13. 13.800 decreased by 10% =
14. 14.450 increased by 40% =
15. 15.525 decreased by 12% =
16. 16.100 increased by 5% =
17. 17.60 decreased by 10% =
18. 18.400 increased by 50% =
19. 19.420 decreased by 30% =
20. 20.475 increased by 40% =
21. 21.336 decreased by 25% =
22. 22.485 increased by 40% =
23. 23.280 increased by 5% =
24. 24.515 increased by 60% =
25. 25.414 decreased by 50% =
26. 26.680 increased by 75% =
27. 27.200 increased by 15% =
28. 28.620 decreased by 35% =
29. 29.525 decreased by 12% =
30. 30.405 decreased by 40% =
31. 31.510 decreased by 30% =
32. 32.280 increased by 10% =
33. 33.465 decreased by 60% =
34. 34.204 increased by 50% =
35. 35.788 decreased by 75% =
36. 36.555 increased by 40% =
37. 37.200 decreased by 10% =
38. 38.695 increased by 60% =
39. 39.530 decreased by 10% =
40. 40.250 decreased by 30% =

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