Evaluate: $9+\left(-8\right)$9+(−8)

Evaluate: $-2+\left(-8\right)$−2+(−8)

Evaluate: $3-\left(-9\right)$3−(−9)

Evaluate: $-2-\left(-8\right)$−2−(−8)

Understand addition and subtraction of fractions, decimals, and integers