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 =
-0.3
rational numbers
The distance between a number and zero.
Magnitude
The rule for adding two numbers with different signs.
subtract the numbers and take the sign of the number with the bigger magnitude
19 + (-7) =
12
2.7 - 3 =
-0.3
-40 - (-16) =
-24
Two different numbers that have the same absolute value.
opposite numbers
Having a greater magnitude
the distance from zero is farther
-15.7 + 9.2 =
-6.5
7.6 - (-10) =
17.7
-10 + 6 - 4 =
-8
The set of whole numbers and their opposites.
integers
The rule for subtracting integers or rational numbers.
Rewrite the equation using the additive inverse. (add the opposite)
-1.8 + 3.3 =
1.5
83.36 - (-46.50) =
129.86
-130 - (-120) + 45
35
A pair of numbers whose sum is zero
zero pair
Rewrite the problem:
11 - (-5) =
11 + 5 =
-4.29 + -3.21
-7.50
-2.32 - (-1.33) =
-0.99
-9.04