Addition of Real Numbers

Rule:
1) If the signs are the same, we add the digits & keep the common sign.

ex) (-3) + (-8) = 11
Both are negative

ex) 8+5 = 13
Both numbers are
positive

2) If the signs are different, we subtract common digits and keep the sign of the larger digit.

ex) (-7) + 11 = 4
“11” is the larger
digit, so the sum
“4” is positive

ex) (-19) + (6) = -13
Larger number is
negative, so the
sum is negative

ex) (-3)+(7)+(-11) = -7
(-14)+(7)

ex) 7/10 + (-2/5)
7/10 + (-2/5*2/2)
7/10 + (-4/10) = 3/10

You can also see the above example like this: 7+(-4)/10 = 3/10

ex) -50 + (-7/9) + 35 + (-11/9)
-15 + (-18/9)
-15 + (-2) = -17

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