Key Terms
The set of numbers less than zero.
negative numbers
The rule for adding two numbers with the same sign.
add the digits and keep the sign
-20 + (-14) =
-34
-7 - 12 =
-19
How much time is left in class?
see teacher...look at clocks.
The distance between a number and zero.
absolute value
The rule for adding two numbers with different signs.
3/5 + 4/5 =
7/5 or 1 2/5
2.7 - 3 =
-0.3
-40 - (-16) =
-24
A decimal that ends.
Terminating Decimal
Having a greater absolute value means.
the distance from zero is farther
-15.7 + 9.2 =
-6.5
-2/3 - (-1/3) =
-1/3
-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
-5(-3) =
15
The set of numbers that can be written as a fraction. (The denominator cannot be zero.)
Rational Number
Rewrite the problem:
11 - (-5) =
11 + 5 =
3/4 + 1/2 =
5/4 or 1 1/4
3/4 - 1/12 =
8/12 or 4/6 or 2/3
-10(12) =
-120