To add signed numbers on a number line, start at the first addend and move by the second:
- if the second is positive, move to the right by its absolute value;
- if the second is negative, move to the left by its absolute value.
This matches the idea a+b=a+(signed step).
Start at a, then move by b with the correct direction
b>0 — right; b<0 — left
The landing point is the sum a+b
Addition on the number line
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