Final answer:
To subtract 99 from 1001, we start from the ones place and borrow from higher places whenever necessary. The result is -8.
Step-by-step explanation:
To subtract 99 from 1001, we line up the numbers vertically, starting with the ones place. Subtracting 9 from 1 is not possible, so we borrow 1 from the tens place, making the ones place 11 - 9 = 2. Next, we subtract 9 from 0 in the tens place, again needing to borrow from the hundreds place, making the tens place 10 - 9 = 1. Finally, we subtract 9 from 1 in the hundreds place, resulting in 1 - 9 = -8. Therefore, 1001 - 99 = -8.
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