To solve the expression:

\[
400 - (26 + 21 - 11)
\]

First, simplify the expression inside the parentheses:

\[
26 + 21 = 47
\]
\[
47 - 11 = 36
\]

Now substitute this result back into the original expression:

\[
400 - 36 = 364
\]

So, the result is:

\[
\boxed{364}
\]

Would you like more details or have any questions?

Here are 5 related questions to explore further:
1. What is the value of \(500 - (30 + 25 - 15)\)?
2. Can you simplify \(600 - (45 + 35 - 20)\)?
3. How would you solve \(300 - (15 + 10 - 5)\)?
4. What is \(800 - (60 + 40 - 30)\)?
5. Can you compute \(1,000 - (50 + 40 - 20)\)?

**Tip**: When solving problems with parentheses, always simplify the inner expression first before performing any operations outside of the parentheses.

Learn how to solve the arithmetic expression 400 - (26 + 21 - 11) step by step. This example demonstrates key concepts in arithmetic and order of operations, ideal for students in Grades 5-7.

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