To find out how much longer Kiki runs during the second week of track practice than the first week, we need to subtract the distance she ran in the first week from the distance she ran in the second week.
Kiki's distance for the first week is 437 miles, and for the second week, it is 623 miles.
Now, we perform the subtraction:
\[ 623 - 437 \]
Calculating this step by step:
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Start with the first column (units):
- \(3 - 7\): Since we cannot subtract 7 from 3, we borrow 1 from the next column.
- The 2 in the tens place becomes 1, and 3 becomes 13.
- Now, \(13 - 7 = 6\).
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Move to the next column (tens):
- Now we have 1 (from borrowing) minus 3.
- We borrow again: the 6 in the hundreds becomes 5 and we make the 1 into 11.
- Now, \(11 - 3 = 8\).
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Finally, in the hundreds column:
- Now we have \(5 - 4 = 1\).
Putting it all together, we have:
\[ 623 - 437 = 186 \]
Thus, Kiki runs 186 miles longer in the second week than in the first week.
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