Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 652 · 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. 1.745 increased by 20% =
2. 2.40 decreased by 30% =
3. 3.455 increased by 40% =
4. 4.480 increased by 15% =
5. 5.385 increased by 40% =
6. 6.60 increased by 5% =
7. 7.160 decreased by 10% =
8. 8.475 increased by 12% =
9. 9.775 decreased by 20% =
10. 10.740 decreased by 15% =
11. 11.510 increased by 10% =
12. 12.55 decreased by 40% =
13. 13.620 increased by 15% =
14. 14.720 increased by 5% =
15. 15.655 increased by 40% =
16. 16.315 decreased by 60% =
17. 17.165 increased by 40% =
18. 18.555 increased by 40% =
19. 19.750 increased by 12% =
20. 20.425 increased by 12% =
21. 21.664 increased by 50% =
22. 22.60 decreased by 25% =
23. 23.380 increased by 15% =
24. 24.785 increased by 20% =
25. 25.75 decreased by 20% =
26. 26.600 increased by 60% =
27. 27.540 increased by 10% =
28. 28.350 increased by 30% =
29. 29.750 increased by 10% =
30. 30.335 increased by 40% =
31. 31.570 increased by 20% =
32. 32.700 decreased by 15% =
33. 33.370 increased by 10% =
34. 34.400 decreased by 12% =
35. 35.720 decreased by 5% =
36. 36.60 increased by 50% =
37. 37.560 increased by 15% =
38. 38.430 decreased by 10% =
39. 39.280 decreased by 25% =
40. 40.462 decreased by 50% =

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