Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 73 · 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. 1.280 increased by 5% =
2. 2.200 decreased by 5% =
3. 3.400 decreased by 5% =
4. 4.590 increased by 30% =
5. 5.140 decreased by 5% =
6. 6.580 increased by 15% =
7. 7.745 decreased by 20% =
8. 8.420 decreased by 15% =
9. 9.500 increased by 12% =
10. 10.65 decreased by 60% =
11. 11.260 increased by 30% =
12. 12.160 increased by 20% =
13. 13.520 increased by 35% =
14. 14.290 increased by 30% =
15. 15.445 increased by 40% =
16. 16.216 decreased by 50% =
17. 17.400 increased by 15% =
18. 18.540 decreased by 40% =
19. 19.770 decreased by 10% =
20. 20.780 decreased by 5% =
21. 21.560 decreased by 30% =
22. 22.612 decreased by 25% =
23. 23.688 decreased by 50% =
24. 24.145 decreased by 20% =
25. 25.40 increased by 30% =
26. 26.85 increased by 60% =
27. 27.575 decreased by 12% =
28. 28.320 increased by 15% =
29. 29.300 decreased by 8% =
30. 30.470 decreased by 20% =
31. 31.100 increased by 15% =
32. 32.88 increased by 75% =
33. 33.340 decreased by 15% =
34. 34.332 increased by 75% =
35. 35.640 decreased by 25% =
36. 36.80 increased by 30% =
37. 37.150 decreased by 12% =
38. 38.460 increased by 15% =
39. 39.286 decreased by 50% =
40. 40.720 increased by 75% =

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