Using the identity property of addition, add the following numbers: 7 + 0 =

Using the identity property of addition, add the following numbers: 0 + 13 =

Using the identity property of addition, add the following numbers: 0 + ? = 23

Using the identity property of addition, add the following numbers: ? + 0 = 47

Using the identity property of addition, add the following numbers: 0 + ? = 623

Using the identity property of addition, add the following numbers: 0 + 177 = ?

Using the identity property of addition, add the following numbers: 0 + ? = 15

Using the identity property of addition, add the following numbers: 75 + ? = 75

Is the following equation correct?: 68 + 0 = 86