Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 979 · 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. 1.426 increased by 50% =
2. 2.130 increased by 10% =
3. 3.360 increased by 15% =
4. 4.435 decreased by 20% =
5. 5.780 increased by 10% =
6. 6.700 increased by 35% =
7. 7.120 decreased by 40% =
8. 8.235 increased by 60% =
9. 9.540 increased by 15% =
10. 10.55 decreased by 20% =
11. 11.280 increased by 35% =
12. 12.660 increased by 75% =
13. 13.700 increased by 8% =
14. 14.350 decreased by 8% =
15. 15.680 increased by 30% =
16. 16.320 decreased by 40% =
17. 17.775 increased by 20% =
18. 18.90 increased by 30% =
19. 19.165 increased by 20% =
20. 20.720 increased by 15% =
21. 21.172 increased by 75% =
22. 22.225 decreased by 60% =
23. 23.240 decreased by 50% =
24. 24.780 decreased by 5% =
25. 25.530 decreased by 60% =
26. 26.775 increased by 8% =
27. 27.200 decreased by 10% =
28. 28.320 increased by 10% =
29. 29.620 decreased by 10% =
30. 30.800 increased by 15% =
31. 31.760 increased by 50% =
32. 32.115 decreased by 40% =
33. 33.508 increased by 25% =
34. 34.120 decreased by 60% =
35. 35.90 increased by 30% =
36. 36.800 increased by 5% =
37. 37.580 decreased by 5% =
38. 38.400 increased by 35% =
39. 39.690 increased by 40% =
40. 40.125 increased by 12% =

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