Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 965 · 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. 1.425 increased by 12% =
2. 2.508 increased by 75% =
3. 3.675 decreased by 12% =
4. 4.560 increased by 5% =
5. 5.780 decreased by 15% =
6. 6.780 increased by 20% =
7. 7.570 decreased by 30% =
8. 8.690 increased by 30% =
9. 9.105 decreased by 60% =
10. 10.740 increased by 60% =
11. 11.600 increased by 12% =
12. 12.340 decreased by 15% =
13. 13.730 increased by 50% =
14. 14.572 decreased by 75% =
15. 15.475 increased by 12% =
16. 16.684 decreased by 25% =
17. 17.280 decreased by 15% =
18. 18.725 increased by 12% =
19. 19.45 increased by 20% =
20. 20.140 increased by 15% =
21. 21.605 decreased by 40% =
22. 22.550 increased by 12% =
23. 23.75 increased by 12% =
24. 24.670 decreased by 20% =
25. 25.300 decreased by 35% =
26. 26.240 increased by 15% =
27. 27.275 increased by 12% =
28. 28.100 decreased by 12% =
29. 29.726 increased by 50% =
30. 30.125 decreased by 40% =
31. 31.200 increased by 5% =
32. 32.125 decreased by 12% =
33. 33.720 decreased by 30% =
34. 34.735 decreased by 20% =
35. 35.132 decreased by 75% =
36. 36.430 decreased by 10% =
37. 37.250 decreased by 10% =
38. 38.320 increased by 35% =
39. 39.310 increased by 20% =
40. 40.225 increased by 12% =

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