We can make the following model:
and now, in order to obtain the result of the division 344/2, we must divide in two parts those model:
that is, we divided in 2 parts our blocks. However, we can see that the block in the middle must be divided in two parts.
Since this block corresponds the hundreds, each part belong to the tens, so we must add 5 parts to the tens.
Therefore, we have
This means the the answer is 172.