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
-2.4 + (-1.4) =
-3.8
-7 - 12 =
-19
Fractions, decimals, and integers are all what kind of numbers?
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.
1.9 + (-0.7) =
1.2
2.7 - 3 =
-0.3
-40 x -2
80
Two numbers that are the same distance from zero are called...
opposite numbers
What can we do when we have a problem like this:
8 - (-2)
Turn it into addition: 8 + 2
-15.7 + 9.2 =
-6.5
7.6 - (-10) =
17.6
(-10)(-2)(-1)
-20
The set of whole numbers and their opposites.
integers
What do fractions have to have for us to be able to add and subtract them?
The same denominator
-1/4 + 3/4
1/2
83.36 - (-46.50) =
129.86
-130 - (-120) + 45
35
For a decimal to be rational, it has to be ______________ or _______________.
terminating or repeating
Give an example of a repeating decimal and a terminating decimal.
Answers will vary
-5/6 + -7/6
-2
3/8 - 1/3
1/24
-9.04