Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 212 · 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. 1.540 increased by 10% =
2. 2.235 increased by 20% =
3. 3.480 increased by 5% =
4. 4.100 increased by 15% =
5. 5.460 increased by 35% =
6. 6.152 increased by 75% =
7. 7.84 increased by 75% =
8. 8.580 increased by 30% =
9. 9.600 increased by 35% =
10. 10.750 increased by 12% =
11. 11.150 increased by 12% =
12. 12.180 increased by 5% =
13. 13.508 decreased by 75% =
14. 14.244 increased by 25% =
15. 15.600 increased by 60% =
16. 16.560 increased by 35% =
17. 17.130 decreased by 10% =
18. 18.520 increased by 15% =
19. 19.80 decreased by 10% =
20. 20.130 increased by 20% =
21. 21.415 increased by 20% =
22. 22.600 increased by 12% =
23. 23.90 decreased by 50% =
24. 24.300 increased by 30% =
25. 25.614 increased by 50% =
26. 26.130 decreased by 40% =
27. 27.244 increased by 75% =
28. 28.255 decreased by 40% =
29. 29.200 decreased by 8% =
30. 30.420 increased by 15% =
31. 31.500 increased by 10% =
32. 32.410 increased by 10% =
33. 33.50 decreased by 8% =
34. 34.380 increased by 30% =
35. 35.250 increased by 8% =
36. 36.180 increased by 5% =
37. 37.680 decreased by 35% =
38. 38.770 decreased by 60% =
39. 39.275 increased by 8% =
40. 40.300 decreased by 12% =

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