Question

Explain why you should record a 1 in the tens column when you regroup in an addition problem

Answer 1

because if u dont regroup u get a completely different answer
19
+19
--------
218

thats what u get if u dont regroup unlike when its done the right way

19
+19
-------
38

Answer 2

Explained below.

Explanation:

Consider the addition below:

19

+ 29

Since the sum in the one's column is 18, a two-digit number, we separate the number as 1 ten and 8 ones.

We now, keep the unit digit 8 and carry over the 1 ten to the tenth column.

Hope this makes sense.