Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 692 · 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. 1.395 decreased by 20% =
2. 2.595 decreased by 60% =
3. 3.755 decreased by 40% =
4. 4.230 increased by 10% =
5. 5.640 decreased by 40% =
6. 6.190 decreased by 10% =
7. 7.300 increased by 15% =
8. 8.400 decreased by 35% =
9. 9.195 decreased by 40% =
10. 10.720 increased by 10% =
11. 11.550 increased by 10% =
12. 12.220 increased by 5% =
13. 13.550 decreased by 10% =
14. 14.400 decreased by 5% =
15. 15.668 increased by 25% =
16. 16.610 increased by 30% =
17. 17.60 increased by 35% =
18. 18.800 increased by 15% =
19. 19.566 decreased by 50% =
20. 20.660 increased by 30% =
21. 21.270 increased by 30% =
22. 22.640 decreased by 5% =
23. 23.704 decreased by 75% =
24. 24.760 decreased by 35% =
25. 25.500 increased by 5% =
26. 26.680 decreased by 10% =
27. 27.760 decreased by 15% =
28. 28.384 increased by 25% =
29. 29.380 decreased by 20% =
30. 30.500 decreased by 30% =
31. 31.270 increased by 10% =
32. 32.500 increased by 15% =
33. 33.330 increased by 60% =
34. 34.440 decreased by 50% =
35. 35.116 decreased by 25% =
36. 36.200 decreased by 5% =
37. 37.288 decreased by 25% =
38. 38.160 increased by 15% =
39. 39.260 increased by 15% =
40. 40.660 decreased by 35% =

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