Transcript Lesson 2.3

Bell Ringer #3
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Write the following as rational numbers:
1. 4.2
2. -7
3. -5.333
4. -0.68
2.3 Addition of Rational Numbers
Add using a number line.
-3 + 5 =
Add using a number line.
-4 + (-3) =
Add using a number line.
-4 + 9 =
Addition Rules
1.
2.
3.
POS. + POS. = POS.
NEG. + NEG. = NEG.
POS. + NEG.
OR
NEG. + POS.
SUBTRACT & TAKE SIGN OF
NUMBER FURTHER FROM
ZERO
Addition Rules
• When the
signs are the
same ….
• When the
signs are
different …
• Add and keep
the same sign.
• Subtract and
keep the sign
of the number
farther from
zero.
Add without a number line.
-12 + (-7) =
Add without a number line.
13 + (-7) =
Add without a number line.
-15 + 10 =
Add without a number line.
-12 + 25 =
Add without a number line.
-1.4 + 8.5 =
Add without a number line.
21 + -36 =
Add without a number line.
3  5
  
4  4
Add without a number line.
2 4
 
3 5
Add without a number line.
5  1
   
8  4
Add without a number line.
-4 + 7 + (-6) + 8=
Add without a number line.
-12 + 8 + (-16) + (-9) =