To evaluate the expression \( 6 \times 7 - 10^2 \), we follow the order of operations:
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Calculate \( 10^2 \): \[ 10^2 = 100 \]
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Calculate \( 6 \times 7 \): \[ 6 \times 7 = 42 \]
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Now substitute these results back into the expression: \[ 42 - 100 \]
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Finally, perform the subtraction: \[ 42 - 100 = -58 \]
Thus, the value of the expression \( 6 \times 7 - 10^2 \) is \(\boxed{-58}\).