Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 437 · 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. 1.662 decreased by 50% =
2. 2.60 increased by 40% =
3. 3.680 decreased by 15% =
4. 4.200 increased by 35% =
5. 5.625 increased by 12% =
6. 6.660 increased by 5% =
7. 7.540 increased by 50% =
8. 8.690 increased by 60% =
9. 9.688 decreased by 25% =
10. 10.800 decreased by 8% =
11. 11.570 decreased by 10% =
12. 12.660 decreased by 5% =
13. 13.140 increased by 35% =
14. 14.645 increased by 60% =
15. 15.225 increased by 60% =
16. 16.100 increased by 20% =
17. 17.780 decreased by 5% =
18. 18.385 decreased by 60% =
19. 19.452 decreased by 75% =
20. 20.540 decreased by 15% =
21. 21.740 decreased by 75% =
22. 22.720 increased by 35% =
23. 23.264 decreased by 75% =
24. 24.470 decreased by 40% =
25. 25.498 increased by 50% =
26. 26.216 increased by 25% =
27. 27.200 increased by 15% =
28. 28.436 decreased by 25% =
29. 29.55 decreased by 60% =
30. 30.500 decreased by 5% =
31. 31.225 increased by 8% =
32. 32.480 increased by 5% =
33. 33.475 decreased by 8% =
34. 34.550 increased by 12% =
35. 35.140 decreased by 40% =
36. 36.180 decreased by 60% =
37. 37.540 increased by 25% =
38. 38.295 increased by 60% =
39. 39.520 decreased by 15% =
40. 40.600 decreased by 5% =

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