4) Write equivalent fractions for $$ \frac{3}{5} $$ and $$ \frac{1}{4} $$ using 20 as the common denominator. $$ \frac{3}{5}-\frac{1}{4}=\frac{\square}{20}-\frac{?}{20} $$

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1. Find the equivalent fraction for $$ \frac{3}{5} $$ with denominator 20 by multiplying both the numerator and the denominator by 4:
   $$
   \frac{3}{5} = \frac{3 \times 4}{5 \times 4} = \frac{12}{20}
   $$

2. Find the equivalent fraction for $$ \frac{1}{4} $$ with denominator 20 by multiplying both the numerator and the denominator by 5:
   $$
   \frac{1}{4} = \frac{1 \times 5}{4 \times 5} = \frac{5}{20}
   $$

3. Substitute the equivalent fractions into the expression:
   $$
   \frac{3}{5}-\frac{1}{4}=\frac{12}{20}-\frac{5}{20}
   $$
$$ \frac{3}{5} - \frac{1}{4} = \frac{12}{20} - \frac{5}{20} $$

Write equivalent fractions for and
using 20 as the common denominator.

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Write equivalent fractions for and using 20 as the common denominator.