Use a number line to understand the movement of adding integers.
Adding not only positive numbers with each other, but adding a positive with a negative, or negative with a negative and knowing where the final resulting sum ends up.
Using the idea of movement on a number line , then add multiple integers to find the corresponding sum.
Seeing that grouping integers (via the commutative property) into positives and negatives, leads to knowing that
adding integers with the same sign - you just add the numbers together and keep the sign.
