adding and subtracting rational numbers

⁸/₁₅  +  (-⁶/₁₅) = ?

Simplify if possible.

 ¼ − (-¾)= ?

Simplify if possible.

-1/2 + 2/3=

-36.5 + (-15.56) 

When adding rational numbers with the same sign, you must:

• Subtract and keep the sign of the biggest number

• Add together and keep the sign

• Keep, change, switch

• Add the opposite

234.05 + (-87.598)

What is -3½ - 4½=

 -86.23 - 67.9 = ?

What is the difference of the given problem?

Simplify if possible.