Simplify \(\frac{3}{9}\) to \(\frac{1}{3}\).
\[\frac{6}{5}-\frac{1}{3}\]
Find the Least Common Denominator (LCD) of \(\frac{6}{5},\frac{1}{3}\). In other words, find the Least Common Multiple (LCM) of \(5,3\).
Method 1: By Listing Multiples
List the multiples of each number.
Multiples of 5
: 5, 10, 15, ...
Multiples of 3
: 3, 6, 9, 12, 15, ...
Find the smallest number that is shared by all rows above. This is the LCM.
Method 2: By Prime Factors
List the prime factors of each number.
Prime Factors of 5
: 5
Prime Factors of 3
: 3
Find the union of these primes.
\[3,5\]
Multiply these numbers: \(3\times 5=15\). This is the LCM.
Make the denominators the same as the LCD.
\[\frac{6\times 3}{5\times 3}-\frac{1\times 5}{3\times 5}\]
Simplify. Denominators are now the same.
\[\frac{18}{15}-\frac{5}{15}\]
Join the denominators.
\[\frac{18-5}{15}\]
Simplify.
\[\frac{13}{15}\]
Decimal Form: 0.866667
13/15
