Subtract 423–23.5
423 - 23.5 equals 399.5
To subtract 423 - 23.5, follow these steps:
Step 1: Write down the numbers vertically, with the larger number on top and the smaller number on the bottom:
423
-23.5
Step 2: Subtract the numbers in the rightmost column (the ones place):
3 - 5 = -2
Since we cannot subtract a larger number from a smaller number in the ones place, we need to borrow from the tens place.
Step 3: Borrowing from the tens place: Reduce the number in the tens place by 1 (4 becomes 3) and add 10 to the ones place (which is now -2 + 10 = 8).
32
-20.5
Step 4: Subtract the numbers in the rightmost column (the tens place):
3 - 0 = 3
Step 5: Subtract the numbers in the rightmost column (the tenths place):
2 - 5 = -3
Since we cannot subtract a larger number from a smaller number in the tenths place again, we need to borrow from the ones place.
Step 6: Borrowing from the ones place: Reduce the number in the ones place by 1 (3 becomes 2) and add 10 to the tenths place (which is now -3 + 10 = 7).
32
-10.5
Step 7: Subtract the numbers in the rightmost column (the ones place):
2 - 0 = 2
Step 8: Subtract the numbers in the rightmost column (the tenths place):
3 - 5 = -2
Step 9: Subtract the numbers in the rightmost column (the hundredths place):
1 - 0 = 1
Step 10: Combine the results of each column to get the final answer:
423
-23.5
------
379.5
Therefore, 423 - 23.5 = 379.5.