29.
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The sum of 1 + 8 is 9.
The sum of 8, 11 and 9 is 28.
The sum of 8 and 4 is 12. In mathematics, addition is the operation of combining two or more numbers to find their total. In this case, when you add 8 and 4 together, you get the sum of 12.
3 and 9 Difference: 9-3=6 Sum: 9+3=12
9 x 3 = 27 9 + 3 = 12