In any base other than 2 (ie other than binary):
10101010 + 01111 = 10102121
In base 2 (binary):
10101010 + 01111 = 10111001
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10,101,010 + 01,111 = 10,102,121Although you didn't say so, we suspect that you may have meantthe two numbers in the question to be binary (base-2) numbers.If so, then| 0 | 0 | 0 | 0= (170)100 | | | | = (15)10Their sum is (185)10
170
Decimal: 170Hex: AA
2 + 8 + 32 + 128 ie 170
Convert each group of 4 bits into one hexadecimal digit. 1010 is "A" in hexadecimal, so this particular number is "AA".