The document discusses key properties and rules of addition and subtraction of real numbers. It defines the identity property of addition as any number n plus 0 equals n, and 0 plus n also equals n. The inverse property of addition states that for any number n, there is an additive inverse -n such that n plus -n equals 0. It also outlines rules for adding numbers with the same sign, adding numbers with different signs, and subtracting numbers by adding the opposite of the second number.

1. Topic Mathematical Words In My Own Words
Identity Property of For every real number n,
Addition
n + 0 = n and 0 + n = n.
Inverse Property of For every real number n,
Additon there is an additive
inverse –n such that
n + (-n) = 0
Rule for Adding
Add their absolute values
Numbers with the
and keep the sign of the
Same Sign
addends
Rule for Adding Subtract their absolute
Numbers with values and keep the sign
Different Signs of the number with the
largest absolute value
Rule for Subtracting
Add the opposite of the
Numbers
second number