Video Transcript
Perform the following column
subtraction: 9,201 subtract 2,468.
In this question, we have to
subtract a four-digit number from a four-digit number using the standard written
method. We always start by subtracting in
the ones column. 9,201 has one one, and 2,468 has
eight ones. But one is less than eight. We don’t have enough ones to
subtract eight from. So we need to regroup. So we need to look to the tens
column. But there’s zero in the tens
place. So we need to take a hundred from
the hundreds column and add it to the tens column. So now we have 10 10s. We need to take one of these tens,
so we’ve got nine left now, and exchange it for 10 ones.
Now that we’ve got 11 ones, we can
subtract our eight ones. 11 take away eight is three. Now we can move into the tens
place. We’ve got nine 10s, and we need to
subtract six 10s. Nine take away six leaves us with
three 10s. Moving into the hundreds column,
we’ve got one 100, and we need to take away four 100s. We know that one is less than four,
so we don’t have enough hundreds to subtract from. We’re going to need to exchange
again. We need to take one of our
thousands and exchange it for 10 100s. Now we’ve got 11 100s. We can subtract four. 11 100s take away four 100s leaves
us with seven 100s. Finally, we can subtract in the
thousands column. We’ve got eight 1,000s, and we need
to subtract two 1,000s. And we know that eight take away
two leaves us with six 1,000s. 9,201 subtract 2,468 equals
6,733.
