Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 231 · 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. 1.40 increased by 15% =
2. 2.600 decreased by 5% =
3. 3.460 increased by 15% =
4. 4.175 increased by 40% =
5. 5.570 decreased by 20% =
6. 6.275 increased by 8% =
7. 7.580 decreased by 5% =
8. 8.490 decreased by 30% =
9. 9.80 increased by 75% =
10. 10.690 increased by 10% =
11. 11.172 increased by 25% =
12. 12.94 increased by 50% =
13. 13.700 increased by 5% =
14. 14.640 increased by 15% =
15. 15.85 decreased by 40% =
16. 16.800 decreased by 15% =
17. 17.350 increased by 8% =
18. 18.668 increased by 75% =
19. 19.180 increased by 15% =
20. 20.580 increased by 20% =
21. 21.345 decreased by 60% =
22. 22.40 increased by 10% =
23. 23.240 decreased by 5% =
24. 24.416 increased by 75% =
25. 25.50 increased by 20% =
26. 26.100 increased by 8% =
27. 27.125 increased by 12% =
28. 28.200 decreased by 5% =
29. 29.50 increased by 40% =
30. 30.720 decreased by 75% =
31. 31.125 decreased by 12% =
32. 32.678 decreased by 50% =
33. 33.76 increased by 75% =
34. 34.650 decreased by 30% =
35. 35.310 increased by 60% =
36. 36.350 increased by 12% =
37. 37.400 decreased by 12% =
38. 38.755 increased by 60% =
39. 39.75 increased by 8% =
40. 40.60 increased by 15% =

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