Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 612 · 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. 1.510 decreased by 30% =
2. 2.748 increased by 75% =
3. 3.205 increased by 60% =
4. 4.736 decreased by 25% =
5. 5.100 increased by 15% =
6. 6.75 decreased by 60% =
7. 7.416 decreased by 50% =
8. 8.756 increased by 75% =
9. 9.140 decreased by 15% =
10. 10.430 increased by 30% =
11. 11.770 increased by 10% =
12. 12.40 increased by 10% =
13. 13.200 decreased by 8% =
14. 14.208 decreased by 50% =
15. 15.740 decreased by 15% =
16. 16.52 increased by 25% =
17. 17.350 increased by 8% =
18. 18.510 decreased by 10% =
19. 19.80 increased by 10% =
20. 20.78 increased by 50% =
21. 21.600 increased by 10% =
22. 22.795 increased by 20% =
23. 23.130 decreased by 50% =
24. 24.670 increased by 20% =
25. 25.560 decreased by 10% =
26. 26.404 decreased by 25% =
27. 27.505 increased by 40% =
28. 28.320 increased by 15% =
29. 29.540 increased by 40% =
30. 30.400 increased by 8% =
31. 31.650 increased by 8% =
32. 32.240 increased by 15% =
33. 33.100 increased by 5% =
34. 34.530 increased by 10% =
35. 35.56 increased by 50% =
36. 36.680 increased by 15% =
37. 37.425 increased by 12% =
38. 38.596 decreased by 75% =
39. 39.648 decreased by 75% =
40. 40.640 increased by 35% =

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