Transcript 2.2
2.2
Subtracting Rational Numbers
2.2 – Subtracting Rational #s
Goals / “I can…”
Subtract rational numbers
Apply subtraction
2.2 – Subtracting Rational #s
Example: Using a number line
Yesterday when we added, we moved the
line to the right. Today when we subtract
we move it to the left.
2.2 – Subtracting Rational #s
Using your calculator, do the following
problems:
5 + (-7) =
5–7=
-6 + (-3) =
-6 – 3 =
What conclusion can you make?
2.2 – Subtracting Rational #s
RULE: Add the opposite - to subtract a
number, switch the subtraction sign to
add and take the opposite of the next
number
2.2 – Subtracting Rational #s
Example:
-6 – 7 =
2.5 – (-7.6) =
2.2 – Subtracting Rational #s
How did we solve 8 ?
2.2 – Subtracting Rational #s
What if we had more than one number in
the absolute value?
Treat them like parentheses.
2.2 – Subtracting Rational #s
Example: Simplify
12 6
19 27
14 (16)
2.2 – Subtracting Rational #s
Example: Evaluating Expressions
Let x = -3 and y = -6
1. x – y
2. y – x
3. –x – y
4. –x – (-y)