Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 850 · 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. 1.555 increased by 20% =
2. 2.560 increased by 60% =
3. 3.600 increased by 15% =
4. 4.784 increased by 50% =
5. 5.315 increased by 20% =
6. 6.180 decreased by 15% =
7. 7.56 decreased by 25% =
8. 8.720 increased by 5% =
9. 9.660 decreased by 5% =
10. 10.600 increased by 15% =
11. 11.170 decreased by 30% =
12. 12.306 increased by 50% =
13. 13.696 increased by 25% =
14. 14.340 increased by 5% =
15. 15.622 increased by 50% =
16. 16.92 increased by 75% =
17. 17.124 increased by 75% =
18. 18.250 increased by 8% =
19. 19.65 increased by 40% =
20. 20.75 increased by 12% =
21. 21.770 decreased by 10% =
22. 22.180 increased by 15% =
23. 23.650 increased by 12% =
24. 24.280 decreased by 10% =
25. 25.640 decreased by 25% =
26. 26.640 decreased by 35% =
27. 27.425 increased by 12% =
28. 28.90 decreased by 40% =
29. 29.740 increased by 50% =
30. 30.72 increased by 75% =
31. 31.700 increased by 12% =
32. 32.180 decreased by 15% =
33. 33.560 decreased by 60% =
34. 34.136 increased by 75% =
35. 35.580 increased by 60% =
36. 36.300 increased by 12% =
37. 37.155 increased by 40% =
38. 38.500 increased by 8% =
39. 39.400 decreased by 50% =
40. 40.480 increased by 40% =

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