Video Transcript
Find the value of the following: 34
subtract 15.
In this question, we’re subtracting
a two-digit number from a two-digit number using the column subtraction method. We need to start by subtracting in
the ones column. 34 has four ones, and 15 has five
ones. So we need to calculate four
subtract five. At the moment, we don’t have enough
ones to subtract our five from. We’re going to need to regroup. We need to take one of our
tens. So now we’ve got two 10s instead of
three. And we can add 10 ones into the
ones column. Instead of having four ones, we’ve
got 14 ones. What is 14 take away five? It’s nine. So we can write this in the ones
column.
Next, we need to subtract the
tens. Two 10s take away one 10 leaves us
with one 10. 34 subtract 15 equals 19. We found the answer using column
subtraction.
