To evaluate the expression \( \frac{18}{7} - u \) when \( u = 4 \):

1. Substitute \( u = 4 \) into the expression:

\[
\frac{18}{7} - 4
\]

2. Convert the whole number \( 4 \) into a fraction with the same denominator as \( \frac{18}{7} \):

\[
4 = \frac{28}{7}
\]

3. Now, subtract the fractions:

\[
\frac{18}{7} - \frac{28}{7} = \frac{18 - 28}{7} = \frac{-10}{7}
\]

So, the result is \( \frac{-10}{7} \) or approximately -1.43.

Would you like any further details or clarification on this? Here are 5 questions you could explore next:

1. How do you convert a whole number into a fraction with a specific denominator?
2. How would the solution change if \( u \) were a different number?
3. What is the decimal approximation of \( \frac{-10}{7} \)?
4. Can you simplify the expression if both the numerator and denominator have common factors?
5. What would the result be if the expression were \( \frac{18}{7} + u \) instead?

**Tip**: Always convert whole numbers to fractions with common denominators when subtracting fractions!

Learn how to evaluate the expression 18/7 - u when u = 4 by converting whole numbers to fractions with a common denominator. This problem demonstrates how to subtract fractions and is suitable for students in Grades 6-8.

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