Simplify to Add: Fill in the missing numbers to simplify and add.

To solve the problem, we need to simplify each addition by breaking the numbers into more manageable parts. Let's go through each problem step by step.

Problem 1: \( 88 + 57 \)

1. Break down the numbers:
- \( 88 \) can be written as \( 90 - 2 \).
- \( 57 \) remains as it is.
- So, \( 88 + 57 = (90 - 2) + 57 \).

2. Simplify:
- \( 90 + 57 = 147 \).
- Subtract the extra \( 2 \): \( 147 - 2 = 145 \).

3. Fill in the blanks:
- \( 88 + 57 = 90 + 55 \).
- \( 90 + 55 = 100 + 45 \).
- \( 100 + 45 = 145 \).

So, the answers are:
- \( 90 + 55 \)
- \( 100 + 45 \)
- \( 145 \)

Problem 2: \( 67 + 82 \)

1. Break down the numbers:
- \( 67 \) can be written as \( 60 + 7 \).
- \( 82 \) can be written as \( 80 + 2 \).

2. Simplify:
- \( 67 + 82 = (60 + 7) + (80 + 2) \).
- Combine the tens and ones: \( (60 + 80) + (7 + 2) = 140 + 9 = 149 \).

3. Fill in the blanks:
- \( 67 + 82 = 70 + 80 \).
- \( 70 + 80 = 100 + 50 \).
- \( 100 + 50 = 149 \).

So, the answers are:
- \( 70 + 80 \)
- \( 100 + 50 \)
- \( 149 \)

Problem 3: \( 128 + 43 \)

1. Break down the numbers:
- \( 128 \) can be written as \( 130 - 2 \).
- \( 43 \) remains as it is.
- So, \( 128 + 43 = (130 - 2) + 43 \).

2. Simplify:
- \( 130 + 43 = 173 \).
- Subtract the extra \( 2 \): \( 173 - 2 = 171 \).

3. Fill in the blanks:
- \( 128 + 43 = 130 + 41 \).
- \( 130 + 41 = 100 + 71 \).
- \( 100 + 71 = 171 \).

So, the answers are:
- \( 130 + 41 \)
- \( 100 + 71 \)
- \( 171 \)

Problem 4: \( 279 + 54 \)

1. Break down the numbers:
- \( 279 \) can be written as \( 280 - 1 \).
- \( 54 \) remains as it is.
- So, \( 279 + 54 = (280 - 1) + 54 \).

2. Simplify:
- \( 280 + 54 = 334 \).
- Subtract the extra \( 1 \): \( 334 - 1 = 333 \).

3. Fill in the blanks:
- \( 279 + 54 = 280 + 53 \).
- \( 280 + 53 = 300 + 33 \).
- \( 300 + 33 = 333 \).

So, the answers are:
- \( 280 + 53 \)
- \( 300 + 33 \)
- \( 333 \)

Problem 5: \( 436 + 76 \)

1. Break down the numbers:
- \( 436 \) remains as it is.
- \( 76 \) can be written as \( 80 - 4 \).
- So, \( 436 + 76 = 436 + (80 - 4) \).

2. Simplify:
- \( 436 + 80 = 516 \).
- Subtract the extra \( 4 \): \( 516 - 4 = 512 \).

3. Fill in the blanks:
- \( 436 + 76 = 430 + 80 \).
- \( 430 + 80 = 500 + 12 \).
- \( 500 + 12 = 512 \).

So, the answers are:
- \( 430 + 80 \)
- \( 500 + 12 \)
- \( 512 \)

Problem 6: \( 718 + 68 \)

1. Break down the numbers:
- \( 718 \) remains as it is.
- \( 68 \) can be written as \( 70 - 2 \).
- So, \( 718 + 68 = 718 + (70 - 2) \).

2. Simplify:
- \( 718 + 70 = 788 \).
- Subtract the extra \( 2 \): \( 788 - 2 = 786 \).

3. Fill in the blanks:
- \( 718 + 68 = 720 + 66 \).
- \( 720 + 66 = 700 + 86 \).
- \( 700 + 86 = 786 \).

So, the answers are:
- \( 720 + 66 \)
- \( 700 + 86 \)
- \( 786 \)

Final Answer:

\[
\boxed{
\begin{array}{ll}
88 + 57 = 90 + 55 & 67 + 82 = 70 + 80 \\
= 100 + 45 & = 100 + 50 \\
= 145 & = 149 \\
128 + 43 = 130 + 41 & 279 + 54 = 280 + 53 \\
= 100 + 71 & = 300 + 33 \\
= 171 & = 333 \\
436 + 76 = 430 + 80 & 718 + 68 = 720 + 66 \\
= 500 + 12 & = 700 + 86 \\
= 512 & = 786 \\
\end{array}
}
\]