Solve the following addition and subtraction problems, showing your work for each.

Here are the solutions for the addition and subtraction problems.

First Table:

• Column 1: $$20 + 3 + 5 = \boxed{28}$$
• Column 2: $$27 + (-2) + 3 = 27 - 2 + 3 = 25 + 3 = \boxed{28}$$
• Column 3: $$32 + (-2) + 5 = 32 - 2 + 5 = 30 + 5 = \boxed{35}$$
• Column 4: $$26 + (-1) + 2 = 26 - 1 + 2 = 25 + 2 = \boxed{27}$$
• Column 5: $$34 + (-2) + 1 = 34 - 2 + 1 = 32 + 1 = \boxed{33}$$
• Column 6: $$25 + 3 + (-5) = 25 + 3 - 5 = 28 - 5 = \boxed{23}$$
• Column 7: $$38 + 1 + (-4) = 38 + 1 - 4 = 39 - 4 = \boxed{35}$$

Second Table:

• Column 1: $$39 + (-4) + 2 = 39 - 4 + 2 = 35 + 2 = \boxed{37}$$
• Column 2: $$22 + 1 + (-2) = 22 + 1 - 2 = 23 - 2 = \boxed{21}$$
• Column 3: $$37 + (-5) + (-1) = 37 - 5 - 1 = 32 - 1 = \boxed{31}$$
• Column 4: $$24 + (-3) + 5 = 24 - 3 + 5 = 21 + 5 = \boxed{26}$$
• Column 5: $$35 + (-5) + 4 = 35 - 5 + 4 = 30 + 4 = \boxed{34}$$
• Column 6: $$23 + 1 + (-4) = 23 + 1 - 4 = 24 - 4 = \boxed{20}$$
• Column 7: $$36 + (-1) + (-5) = 36 - 1 - 5 = 35 - 5 = \boxed{30}$$