Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 647 · 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. 1.672 increased by 50% =
2. 2.340 increased by 25% =
3. 3.50 decreased by 60% =
4. 4.650 increased by 10% =
5. 5.775 decreased by 12% =
6. 6.200 decreased by 15% =
7. 7.310 increased by 30% =
8. 8.90 increased by 30% =
9. 9.146 increased by 50% =
10. 10.100 increased by 8% =
11. 11.380 decreased by 5% =
12. 12.205 decreased by 60% =
13. 13.800 increased by 15% =
14. 14.140 decreased by 35% =
15. 15.740 decreased by 5% =
16. 16.500 decreased by 8% =
17. 17.350 decreased by 12% =
18. 18.300 decreased by 40% =
19. 19.635 decreased by 20% =
20. 20.640 decreased by 10% =
21. 21.440 increased by 5% =
22. 22.668 increased by 25% =
23. 23.460 decreased by 5% =
24. 24.240 increased by 15% =
25. 25.100 increased by 5% =
26. 26.395 increased by 60% =
27. 27.574 decreased by 50% =
28. 28.610 decreased by 50% =
29. 29.700 decreased by 15% =
30. 30.350 increased by 20% =
31. 31.425 decreased by 8% =
32. 32.400 increased by 5% =
33. 33.780 decreased by 5% =
34. 34.136 increased by 75% =
35. 35.200 increased by 8% =
36. 36.520 increased by 25% =
37. 37.500 increased by 12% =
38. 38.735 increased by 40% =
39. 39.160 increased by 10% =
40. 40.758 decreased by 50% =

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