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You must travel –5 steps, i.e., 5 steps backward. Thus, 3+(–5)=–2. The corresponding
subtraction statement is: –2 –3=–5.

 Using the unmarked number line to add and subtract

Just as you can do additions, subtractions and comparisons with small numbers using
the number line above, you can also do them with large numbers by imagining an
‘infinite number line’ or drawing an ‘unmarked number line’ as follows`

This line shows only the position of zero. Other numbers are not marked. It can be
convenient to use this unmarked number line to add and subtract integers. You can