Question

How do I determine the little numbers on the top of the answer in the standard algorithm, WITHOUT HAVING TO DO THE STANDARD ALGORITHM (because I already solved it, but I don;t know the the little numbers on top)

Answer 1

Because you need to line up the numbers vertically with standard algorithm

Answer 2

The standard algorithm for addition has three simple rules:

Rule 1: Line up the numbers vertically by matching the place values - and start with the ones place.

To explain: When you add multi-digit numbers, the problem is typically written vertically - meaning one set of numbers is on top of the other. But, you can't just place the numbers anywhere - there is a proper placement of the numbers based upon place value. Place value is the place a number represents when a number is written in standard form. We will look at an example after we review the rest of the rules.

Rule 2: Add together the numbers that share the same place value - again, start with the ones place.