Adding & Subtracting Rational Numbers

Find the sum or difference

 $-12\ \frac{1}{2\ }\ +\ 4\ \frac{1}{2}$  

 $-0.35\ -\ \left(-0.25\right)$  

Simplify each expression.

 $50\frac{1}{2}\ +\ \left(-12.3\right)$  

What does additive inverse mean

• What you add to a number to get zero

• simply adding 2 numbers

• changing signs

 $3.2\ -\ \left(-5.7\right)$  

 $-3\frac{3}{4}\ +\ 12\frac{1}{4}$  

 $Is\ -\frac{1}{3\ }\ -\ \frac{4}{5\ }\ positive,\ negative,\ or\ zero?$  

 $Is\ \frac{2}{5\ }\ -\ \left(-\frac{5}{6}\right)\ negative,\ positive\ or\ zero$  

• Negative

• Positive

• Zero

Find the value of the expressions  $\left(-8.6\right)\ +\ 7.2$  

 $-4\frac{4}{5}\ +\ 4\frac{2}{5}$  

• -2/5

• 8 6/5

• -8 6/5

• 9