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I put leading zeros, so everything will line up:

01011 (which is eleven)

01010 (which is ten)

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10101 (which is twenty one). The rightmost column is 1+0=1. The next column is 1+1=102. Carry the 1 and you have 1 + 0 + 0 = 1. Then 1+1=102, then carry that 1 for the most significant digit.

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13y ago
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1y ago

The sum of the binary numbers 1011 and 1010 is 10101 in binary.

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Q: What is the sum of the binary numbers 1011 and 1010?
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