Let's look at the number 42,135. Each column in the number has a name.
42,135
The 5 is in the units column.
5
The 3 is in the tens column.
30
The I is in the hundreds column.
100
The 2 is in the thousands column.
2,000
The 4 is in the ten thousands column.
40,000
When we total the columns, we have
42,135
In addition, when you write
47
4 Tens + 7 Units
+
32
+
3 Tens + 2 Units
79
you are saying
7 Tens + 9 Units
You are adding units to units and tens to tens.
One big trouble spot in addition is carrying.
If you do not understand carrying, the following sample should help you.
8
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