Cortinue to use Cammen's algorthim to complete the subtraction. Select the correct choice below and fill in the answer box to complete your choice. A. B. C. $$ \begin{aligned} 72-38 & =(70+42)-(40+8) \ & =(70-40)+(12-8) \ & =\square \end{aligned} $$ $$ \begin{aligned} 72-38 & =(70+12)-(40+8) \ & =(70+40)-(12+8) \ & =\square \end{aligned} $$

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To complete the subtraction using Cammen's algorithm, let's analyze both options step by step.

### Option A:
1. Start with the expression:
   $$
   72 - 38 = (70 + 42) - (40 + 8)
   $$
2. Simplify:
   $$
   = (70 - 40) + (42 - 8)
   $$
3. Calculate each part:
   - $$70 - 40 = 30$$
   - $$42 - 8 = 34$$
4. Combine the results:
   $$
   = 30 + 34 = 64
   $$

### Option B:
1. Start with the expression:
   $$
   72 - 38 = (70 + 12) - (40 + 8)
   $$
2. Simplify:
   $$
   = (70 - 40) + (12 - 8)
   $$
3. Calculate each part:
   - $$70 - 40 = 30$$
   - $$12 - 8 = 4$$
4. Combine the results:
   $$
   = 30 + 4 = 34
   $$

### Conclusion:
- For **Option A**, the final answer is $$64$$.
- For **Option B**, the final answer is $$34$$.

Since the correct subtraction of $$72 - 38$$ is $$34$$, the correct choice is **Option B**.

Thus, the completed expression for Option B is:
$$
72 - 38 = (70 + 12) - (40 + 8) = (70 - 40) + (12 - 8) = 34
$$

So, the answer to fill in the box for Option B is $$34$$.
The correct choice is **Option B**, and the completed expression is: $$ 72 - 38 = (70 + 12) - (40 + 8) = (70 - 40) + (12 - 8) = 34 $$ So, the answer to fill in the box is **34**.

Cortinue to use Cammen’s algorthim to complete the subtraction. Select the correct choice below and fill in the answer box to complete your choice.
A. B. C.

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Option A:

Option B:

Conclusion:

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Cortinue to use Cammen’s algorthim to complete the subtraction. Select the correct choice below and fill in the answer box to complete your choice. A. B. C.