To simplify the expression \( 13 , 12 \div 13 - 10 \), follow the order of operations:
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First, perform the division \( 12 \div 13 \): \[ 12 \div 13 = \frac{12}{13} \]
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Next, multiply by 13: \[ 13 \times \frac{12}{13} = 12 \]
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Finally, subtract 10: \[ 12 - 10 = 2 \]
Thus, the simplified expression is: \[ \boxed{2} \]