uses \( \frac{2}{5} \) pound in sandwiches. What common denominator would you use to subtract \( \frac{2}{5} \) from \( \frac{5}{8} \) ?

To subtract \( \frac{2}{5} \) from \( \frac{5}{8} \), you'll want to find a common denominator that is a multiple of both 5 and 8. The least common multiple (LCM) of 5 and 8 is 40. So, you'll convert both fractions to have a denominator of 40 to make the subtraction easier! Once you have both fractions with a common denominator, you can rewrite \( \frac{5}{8} \) as \( \frac{25}{40} \) and \( \frac{2}{5} \) as \( \frac{16}{40} \). Now you're ready to subtract: \( \frac{25}{40} - \frac{16}{40} = \frac{9}{40} \). Happy calculating!