Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 933 · 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. 1.246 increased by 50% =
2. 2.512 decreased by 50% =
3. 3.90 increased by 30% =
4. 4.80 increased by 30% =
5. 5.290 increased by 10% =
6. 6.360 increased by 5% =
7. 7.425 increased by 12% =
8. 8.600 increased by 30% =
9. 9.620 increased by 30% =
10. 10.660 decreased by 15% =
11. 11.555 decreased by 60% =
12. 12.160 increased by 60% =
13. 13.572 increased by 50% =
14. 14.120 increased by 15% =
15. 15.200 decreased by 12% =
16. 16.700 decreased by 30% =
17. 17.800 decreased by 15% =
18. 18.430 increased by 30% =
19. 19.100 decreased by 15% =
20. 20.435 increased by 40% =
21. 21.650 increased by 8% =
22. 22.345 decreased by 40% =
23. 23.320 decreased by 35% =
24. 24.660 increased by 5% =
25. 25.725 decreased by 12% =
26. 26.656 decreased by 75% =
27. 27.575 increased by 20% =
28. 28.450 increased by 10% =
29. 29.540 decreased by 35% =
30. 30.392 increased by 50% =
31. 31.795 decreased by 60% =
32. 32.180 increased by 30% =
33. 33.204 increased by 50% =
34. 34.100 decreased by 15% =
35. 35.232 increased by 75% =
36. 36.218 decreased by 50% =
37. 37.225 decreased by 8% =
38. 38.125 increased by 8% =
39. 39.760 increased by 35% =
40. 40.280 decreased by 40% =

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