Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 527 · 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. 1.560 decreased by 15% =
2. 2.514 increased by 50% =
3. 3.240 decreased by 40% =
4. 4.118 increased by 50% =
5. 5.300 decreased by 15% =
6. 6.780 decreased by 30% =
7. 7.340 increased by 10% =
8. 8.118 decreased by 50% =
9. 9.555 decreased by 40% =
10. 10.770 increased by 30% =
11. 11.290 decreased by 30% =
12. 12.60 decreased by 15% =
13. 13.100 increased by 5% =
14. 14.720 decreased by 50% =
15. 15.300 decreased by 15% =
16. 16.790 increased by 50% =
17. 17.224 decreased by 25% =
18. 18.780 decreased by 10% =
19. 19.150 decreased by 12% =
20. 20.40 decreased by 40% =
21. 21.550 decreased by 12% =
22. 22.120 increased by 5% =
23. 23.380 increased by 10% =
24. 24.545 decreased by 60% =
25. 25.375 increased by 12% =
26. 26.675 increased by 8% =
27. 27.310 decreased by 10% =
28. 28.300 increased by 5% =
29. 29.50 decreased by 12% =
30. 30.540 decreased by 35% =
31. 31.164 decreased by 75% =
32. 32.745 decreased by 20% =
33. 33.560 increased by 5% =
34. 34.690 decreased by 10% =
35. 35.350 decreased by 8% =
36. 36.580 increased by 20% =
37. 37.220 increased by 30% =
38. 38.400 increased by 15% =
39. 39.580 increased by 5% =
40. 40.620 increased by 5% =

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