What is 1001 in decimal?
1001 in binary equals 9 in decimal.
Step-by-step working
| Bit | Position | 2n | Contribution |
|---|---|---|---|
| 1 | 3 | 8 | 8 |
| 0 | 2 | 4 | 0 |
| 0 | 1 | 2 | 0 |
| 1 | 0 | 1 | 1 |
| Total | 1001₂ = 8 + 1 = 9 | ||
How it works
Each bit of 1001 is multiplied by 2 raised to its position (counted from 0 at the right) and the results are added.
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