Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 755 · 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 decreased by 15% =
2. 2.160 decreased by 30% =
3. 3.725 decreased by 12% =
4. 4.775 increased by 40% =
5. 5.350 decreased by 12% =
6. 6.170 increased by 60% =
7. 7.40 decreased by 15% =
8. 8.240 decreased by 10% =
9. 9.420 increased by 10% =
10. 10.370 increased by 30% =
11. 11.230 decreased by 10% =
12. 12.90 decreased by 60% =
13. 13.400 decreased by 40% =
14. 14.340 increased by 15% =
15. 15.444 decreased by 50% =
16. 16.390 decreased by 40% =
17. 17.330 decreased by 40% =
18. 18.175 increased by 60% =
19. 19.620 increased by 15% =
20. 20.288 increased by 25% =
21. 21.295 increased by 60% =
22. 22.340 increased by 15% =
23. 23.500 increased by 5% =
24. 24.400 increased by 8% =
25. 25.260 increased by 35% =
26. 26.130 decreased by 60% =
27. 27.400 increased by 12% =
28. 28.600 increased by 8% =
29. 29.136 decreased by 50% =
30. 30.484 decreased by 50% =
31. 31.590 increased by 30% =
32. 32.325 decreased by 12% =
33. 33.330 increased by 10% =
34. 34.480 decreased by 5% =
35. 35.300 increased by 10% =
36. 36.175 increased by 8% =
37. 37.780 decreased by 20% =
38. 38.700 increased by 10% =
39. 39.48 increased by 25% =
40. 40.104 increased by 25% =

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