Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 4 · 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. 1.580 increased by 35% =
2. 2.90 increased by 10% =
3. 3.775 decreased by 12% =
4. 4.175 decreased by 8% =
5. 5.240 increased by 25% =
6. 6.80 decreased by 35% =
7. 7.220 increased by 5% =
8. 8.432 increased by 25% =
9. 9.310 decreased by 30% =
10. 10.530 decreased by 40% =
11. 11.128 increased by 75% =
12. 12.346 increased by 50% =
13. 13.710 increased by 30% =
14. 14.700 decreased by 15% =
15. 15.675 increased by 8% =
16. 16.160 decreased by 5% =
17. 17.772 decreased by 25% =
18. 18.100 increased by 8% =
19. 19.540 decreased by 15% =
20. 20.670 increased by 40% =
21. 21.385 decreased by 40% =
22. 22.448 increased by 75% =
23. 23.800 increased by 10% =
24. 24.728 increased by 75% =
25. 25.380 increased by 5% =
26. 26.350 decreased by 12% =
27. 27.250 decreased by 50% =
28. 28.600 increased by 60% =
29. 29.80 increased by 20% =
30. 30.175 increased by 20% =
31. 31.750 increased by 8% =
32. 32.125 decreased by 20% =
33. 33.664 increased by 50% =
34. 34.310 decreased by 10% =
35. 35.100 increased by 30% =
36. 36.405 decreased by 20% =
37. 37.648 increased by 75% =
38. 38.520 increased by 5% =
39. 39.502 increased by 50% =
40. 40.320 increased by 20% =

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