Video Transcript
Subtract eight from 66.
In this question, we’re subtracting
a one-digit number from a two-digit number. 66 has two digits, and eight has
one. When we’re subtracting from a
two-digit number, we always start by subtracting the ones. But six is less than eight. We don’t have enough ones to
subtract from. So we need to regroup. We need to take one of our six 10s,
which would leave us with five 10s, and exchange it for 10 ones. So instead of having six ones, we
have 16 ones. Now we have enough ones we can
subtract in the ones column. What is 16 take away eight? It’s eight.
And because we’re subtracting a
one-digit number from a two-digit number, there’s nothing to subtract from our
tens. We had six 10s. We exchanged one of our tens for 10
ones, leaving us with five 10s. And five 10s take away no tens
leaves us with five 10s. 66 take away eight is 58. First, we regrouped one of our tens
and exchanged it for 10 ones. Next, we subtracted the ones. 16 take away eight is eight. Then we subtracted the tens. Five 10s take away no tens is five
10s. We subtracted eight from 66,
leaving us with 58.
