Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 360 · 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. 1.255 increased by 60% =
2. 2.775 increased by 12% =
3. 3.480 decreased by 15% =
4. 4.700 decreased by 15% =
5. 5.760 increased by 35% =
6. 6.780 increased by 15% =
7. 7.60 increased by 50% =
8. 8.244 increased by 75% =
9. 9.680 increased by 20% =
10. 10.600 increased by 20% =
11. 11.720 increased by 60% =
12. 12.788 decreased by 75% =
13. 13.560 increased by 5% =
14. 14.600 decreased by 30% =
15. 15.180 increased by 15% =
16. 16.372 increased by 25% =
17. 17.375 decreased by 60% =
18. 18.510 increased by 10% =
19. 19.236 decreased by 75% =
20. 20.430 decreased by 20% =
21. 21.320 increased by 35% =
22. 22.630 increased by 40% =
23. 23.500 increased by 15% =
24. 24.800 increased by 8% =
25. 25.164 decreased by 25% =
26. 26.125 increased by 12% =
27. 27.530 increased by 10% =
28. 28.120 increased by 10% =
29. 29.376 increased by 75% =
30. 30.100 decreased by 5% =
31. 31.260 decreased by 35% =
32. 32.420 decreased by 35% =
33. 33.455 increased by 40% =
34. 34.640 decreased by 30% =
35. 35.416 increased by 25% =
36. 36.615 increased by 60% =
37. 37.535 decreased by 60% =
38. 38.305 decreased by 40% =
39. 39.580 increased by 5% =
40. 40.525 increased by 12% =

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