To solve the expression \( 1000 - 900 + \frac{900 \times 600}{1000} \), we follow the order of operations (PEMDAS/BODMAS):
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Calculate the multiplication: \[ 900 \times 600 = 540000 \]
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Next, divide the result by 1000: \[ \frac{540000}{1000} = 540 \]
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Now, substitute back into the expression: \[ 1000 - 900 + 540 \]
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Perform the subtractions and additions from left to right: \[ 1000 - 900 = 100 \] \[ 100 + 540 = 640 \]
Thus, the final result is: \[ \boxed{640} \]