Let's practice adding two-digit numbers and one-digit numbers, based on the ones place (ones column) first. To help us, here's a pair of problems:
The first problem helps you figure out the second problem. Let's answer the first problem. What is 5 plus 3? The sum, or answer, of 5 and 3 equals 8. How about the second problem? How do we answer it?
Notice that in the second problem, the digits in the ones place are the same as that of our first problem, 5 plus 3. So if 5 plus 3 equals 8, then 45 plus 3 must equal 48.
Let's look at this new pair:
Again, let's answer the first problem first. What does 3 plus 4 equal? The sum equals 7. What about in the second problem? What's the answer? Remember-look at the digits in the ones place first.
The ones place says 3 plus 4. It is the same as that of the first problem, right? If 3 plus 4 equals 7, then 63 plus 4 must equal 67.
The first problem helps us figure out the second problem.
