Key Terms
The set of numbers less than zero.
negative numbers
The rule for adding two numbers with the same sign.
add the numbers and keep the sign
-20 + (-14) =
-34
-7 - 12 =
-19
rational numbers
The distance between a number and zero.
Absolute Value
The rule for adding two numbers with different signs.
subtract the numbers and take the sign of the number with the larger absolute value.
19 + (-7) =
12
2.7 - 3 =
-0.3
-40 x -2
80
Two different numbers that have the same absolute value.
opposite numbers
Having a greater absolute value.
the distance from zero is farther
-15.7 + 9.2 =
-6.5
7.6 - (-10) =
17.6
(-10)(-2)(-1)
-20
The set of whole numbers and their opposites.
integers
The rule for subtracting integers or rational numbers.
Rewrite the equation using addition and then add the opposite.
-1/4 + 3/4
1/2
83.36 - (-46.50) =
129.86
-130 - (-120) + 45
35
A pair of numbers whose sum is zero
zero pair
Rewrite the problem and the get the answer:
-11 - (-5) =
-11 + 5 = -6
-5/6 + -7/6
-2
3/8 - 1/3
1/24
-9.04