[tex] - 4 + ( - 4) = - 4 - 4 = - 8 \\ - 4 + ( - 3) = - 4 - 3 = - 7 \\ - 4 + ( - 2) = - 4 - 2 = - 6 \\ - 4 + ( - 1) = - 4 - 1 = - 5 \\ - 4 + 0 = - 4 \\ - 4 + 1 = - 3 \\ - 4 + 2 = - 2 \\ - 4 + 3 = - 1 \\ - 4 + 4 = 0[/tex]

[tex] - 3 + ( - 4) = - 3 - 4 = - 7 \\ - 3 + ( - 3) = - 3 - 3 = - 6 \\ - 3 + ( - 2) = - 3 - 2 = - 5 \\ - 3 + ( - 1) = - 3 - 1 = - 4 \\ - 3 + 0 = - 3 \\ - 3 + 1 = - 2 \\ - 3 + 2 = - 1 \\ - 3 + 3 = 0 \\ - 3 + 4 = 1[/tex]

[tex] - 2 + ( - 4) = - 2 - 4 = - 6 \\ - 2 + ( - 3) = - 2 - 3 = - 5 \\ - 2 + ( - 2) = - 2 - 2 = - 4 \\ - 2 + ( - 1) = - 2 - 1 = - 3 \\ - 2 + 0 = - 2 \\ - 2 + 1 = - 1 \\ - 2 + 2 = 0 \\ - 2 + 3 = 1 \\ - 2 + 4 = 2[/tex]

[tex]1 + ( - 4) = 1 - 4 = - 3 \\ 1 + ( - 3) = 1 - 3 = - 2 \\ 1 + ( - 2) = 1 - 2 = - 1 \\ 1 + ( - 1) = 1 - 1 = 0 \\ 1 + 0 = 1 \\ 1 + 1 = 2 \\ 1 + 2 = 3 \\ 1 + 3 = 4 \\ 1 + 4 = 5[/tex]