Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 836 · 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. 1.190 decreased by 10% =
2. 2.680 decreased by 15% =
3. 3.800 decreased by 15% =
4. 4.600 decreased by 12% =
5. 5.124 decreased by 50% =
6. 6.200 increased by 35% =
7. 7.620 increased by 35% =
8. 8.770 increased by 40% =
9. 9.570 decreased by 30% =
10. 10.325 increased by 12% =
11. 11.660 decreased by 5% =
12. 12.430 decreased by 30% =
13. 13.440 decreased by 35% =
14. 14.100 decreased by 10% =
15. 15.775 decreased by 8% =
16. 16.250 increased by 8% =
17. 17.94 decreased by 50% =
18. 18.530 increased by 20% =
19. 19.380 decreased by 5% =
20. 20.120 decreased by 10% =
21. 21.130 decreased by 10% =
22. 22.425 decreased by 12% =
23. 23.692 increased by 75% =
24. 24.470 increased by 30% =
25. 25.40 decreased by 30% =
26. 26.240 increased by 10% =
27. 27.518 increased by 50% =
28. 28.472 increased by 25% =
29. 29.600 increased by 15% =
30. 30.420 decreased by 10% =
31. 31.275 increased by 8% =
32. 32.125 increased by 60% =
33. 33.212 increased by 25% =
34. 34.500 decreased by 12% =
35. 35.800 increased by 35% =
36. 36.400 increased by 15% =
37. 37.620 decreased by 5% =
38. 38.248 decreased by 25% =
39. 39.640 increased by 15% =
40. 40.60 decreased by 75% =

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