Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 494 · 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 50% =
2. 2.620 decreased by 5% =
3. 3.430 decreased by 10% =
4. 4.650 increased by 30% =
5. 5.475 increased by 8% =
6. 6.425 decreased by 60% =
7. 7.290 increased by 30% =
8. 8.250 increased by 12% =
9. 9.360 decreased by 35% =
10. 10.560 decreased by 5% =
11. 11.225 decreased by 8% =
12. 12.780 decreased by 15% =
13. 13.460 increased by 30% =
14. 14.560 decreased by 25% =
15. 15.60 decreased by 30% =
16. 16.96 increased by 50% =
17. 17.640 increased by 40% =
18. 18.600 increased by 12% =
19. 19.142 increased by 50% =
20. 20.400 decreased by 15% =
21. 21.500 decreased by 5% =
22. 22.628 decreased by 50% =
23. 23.40 decreased by 30% =
24. 24.656 decreased by 25% =
25. 25.100 decreased by 12% =
26. 26.610 decreased by 30% =
27. 27.240 increased by 5% =
28. 28.204 decreased by 25% =
29. 29.340 decreased by 15% =
30. 30.350 increased by 12% =
31. 31.580 decreased by 35% =
32. 32.728 decreased by 25% =
33. 33.70 increased by 30% =
34. 34.152 increased by 75% =
35. 35.100 increased by 20% =
36. 36.300 increased by 8% =
37. 37.132 increased by 75% =
38. 38.800 increased by 12% =
39. 39.610 increased by 10% =
40. 40.768 increased by 25% =

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