9
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Yes as for example 2+5 = 7
5+5, 2+8, 7+3, 9+1, etc
This occurs when you add a negative number. An understanding of negative numbers and their place in the number line is appropriate for this subject. EXAMPLE : 15 + (-7) = 15 - 7 = 8
nine add 7 to get from -7 to 0 then add 2 to get to 2 7 + 2 = 9
When you add zero to a number, the number does not change. Ex: 5+0=5 5+2+0=7