If you wereto add 67 and 52, you would structure it like this: 6 7
5 2
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?????
You need to add 7 and 2, which is 9, so yiu put that in the units column. Next, you need to add 6 and 5, which is 11, so yiu need to extend into the hubdreds column, so the answer is 119.
Another example is :
2 8
4 4
------
????
So in this example, you need to add 8 and 4, which equals 12. Now, because this occupies two columns, then yiu put the 1 in ghe tens column. Now yiu add all the numbers of the tens column togther, which sre 2, 4 and 1, which equals 9, so th answer is 92