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Example: Add two numbers using vertical form:

Step 1:
Write the problem in two column place value: ones, tens.

Step 2:
Then add the ones column.

9 ones + 2 ones = 11 ones
There cannot be more than 9 ones in the ones column.
So. regroup the numbers become 1 tens 1 ones.
Move the ten ones into the tens column, as picture above.
Step 3:
Next, add the tens column.

1 tens + 7 tens + 1 tens. = 9 tens.
You will get the answer of 91 with this math tutoring teaching 2 digit addition with regrouping.
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