To make the expression \( 18 - 9 \frac{4}{9} + \frac{7}{9} - 8 \) easiest to add, it's beneficial to group the whole numbers and the fractional parts separately.
Let's rewrite the expression:
\[ 18 - 8 - 9 \frac{4}{9} + \frac{7}{9} \]
The whole numbers we want to group together are \( 18 \), \( -8 \), and \( -9 \), while the fractions \( - \frac{4}{9} \) and \( + \frac{7}{9} \) can be grouped separately.
Thus, the best grouping is:
\[ (18 - 8 - 9) + (-9 \frac{4}{9} + \frac{7}{9}) \]
This corresponds to the second response option:
(18 − 8 − 9)
Thus, the correct grouping to make it easiest to add is:
(18 − 8 − 9).
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