Math worksheet for practicing addition of integers with positive and negative numbers.

Here are the solutions for the integer addition problems, calculated column by column from left to right.

Column 1:
* $-10 + 12 = 2$
* $15 + (-13) = 2$
* $12 + 15 = 27$
* $11 + (-9) = 2$
* $14 + (-10) = 4$
* $-11 + 10 = -1$
* $-14 + (-11) = -25$
* $-11 + (-11) = -22$
* $-15 + (-9) = -24$
* $-15 + (-14) = -29$
* $-9 + (-12) = -21$
* $12 + (-14) = -2$
* $14 + 9 = 23$
* $13 + (-12) = 1$
* $-12 + 10 = -2$
* $10 + (-15) = -5$
* $10 + (-9) = 1$
* $-15 + 15 = 0$
* $-15 + (-12) = -27$
* $14 + 14 = 28$
* $10 + 13 = 23$
* $9 + (-9) = 0$
* $-12 + 13 = 1$
* $11 + (-14) = -3$
* $11 + (-12) = -1$

Column 2:
* $9 + 10 = 19$
* $12 + 11 = 23$
* $-12 + (-9) = -21$
* $-11 + (-15) = -26$
* $-6 + (-12) = -18$
* $9 + (-11) = -2$
* $13 + (-15) = -2$
* $12 + 3 = 15$
* $3 + 11 = 14$
* $13 + (-9) = 4$
* $10 + 10 = 20$
* $-11 + (-5) = -16$
* $-2 + 9 = 7$
* $-13 + (-11) = -24$
* $-11 + 4 = -7$
* $4 + (-5) = -1$
* $-7 + 4 = -3$
* $10 + 11 = 21$
* $3 + 9 = 12$
* $5 + 15 = 20$
* $-9 + 13 = 4$
* $-10 + 6 = -4$
* $11 + (-8) = 3$
* $15 + (-10) = 5$
* $-5 + (-7) = -12$

Column 3:
* $-12 + (-4) = -16$
* $14 + (-15) = -1$
* $-15 + (-4) = -19$
* $-2 + (-15) = -17$
* $7 + 11 = 18$
* $14 + 12 = 26$
* $-15 + (-11) = -26$
* $4 + 3 = 7$
* $-4 + (-7) = -11$
* $1 + 4 = 5$
* $5 + 4 = 9$
* $7 + (-2) = 5$
* $-8 + 10 = 2$
* $-8 + 1 = -7$
* $-5 + 11 = 6$
* $-4 + 13 = 9$
* $-9 + 5 = -4$
* $1 + 5 = 6$
* $-14 + 13 = -1$
* $9 + 1 = 10$
* $2 + 6 = 8$
* $7 + (-8) = -1$
* $5 + (-12) = -7$
* $5 + (-9) = -4$
* $15 + (-8) = 7$

Final Answer:
Column 1: 2, 2, 27, 2, 4, -1, -25, -22, -24, -29, -21, -2, 23, 1, -2, -5, 1, 0, -27, 28, 23, 0, 1, -3, -1
Column 2: 19, 23, -21, -26, -18, -2, -2, 15, 14, 4, 20, -16, 7, -24, -7, -1, -3, 21, 12, 20, 4, -4, 3, 5, -12
Column 3: -16, -1, -19, -17, 18, 26, -26, 7, -11, 5, 9, 5, 2, -7, 6, 9, -4, 6, -1, 10, 8, -1, -7, -4, 7