Partial Sums Method:
Step 1 - Add the value of the digits in the largest place value. In this case it's the 10's place.
Step 2 - Add the value of the digits in the next largest place value. In this case it's the 1's place.
Step 3 - Add the partial sums to get your answer.
75
+23
90
+8
98
You Tube Video Partial Sums Example
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