\( 9 \quad \square \times 7 = 28 \)

To solve the equation: \[ 9 \quad \square \times 7 = 28 \] we need to determine what should replace the square (\(\square\)) to make the equation true. ### Step-by-Step Solution: 1. **Interpret the Equation:** The equation can be read as: \[ 9 \times (\square) \times 7 = 28 \] This implies: \[ 9 \times \square \times 7 = 28 \] 2. **Isolate the Square (\(\square\)):** To find the value of \(\square\), divide both sides of the equation by \(9 \times 7\): \[ \square = \frac{28}{9 \times 7} = \frac{28}{63} \] 3. **Simplify the Fraction:** \[ \frac{28}{63} = \frac{4}{9} \] 4. **Verify the Solution:** Substitute \(\square\) with \(\frac{4}{9}\) in the original equation: \[ 9 \times \frac{4}{9} \times 7 = 4 \times 7 = 28 \] The equation holds true. ### Conclusion: The square (\(\square\)) should be replaced with the fraction \(\frac{4}{9}\). \[ 9 \times \frac{4}{9} \times 7 = 28 \] **Answer:** The square must be replaced with the fraction \(\frac{4}{9}\).