You don't need "models and equations"; if the denominator is the same, just subtract the numerators.
It will help when you are trying to add and subtract fractions.
Finding an LCM will help when you want to add and subtract fractions.
Finding the LCM will help you when you need to add and subtract fractions.
Finding the prime factorizations of the denominators will help you find the least common denominator. Converting to equivalent fractions with like denominators will allow you to subtract them successfully.
Finding the LCM will help you add and subtract fractions. Finding the GCF will help you reduce fractions.
It will help when you want to add and subtract unlike fractions.
The LCM is used to help you add or subtract fractions with different denominators.
Finding factors is the first step in finding the GCF and the LCM. They will help you to reduce fractions, or add and subtract them.
It depends on the specific problem. If you have an equation that involves fractions, quite often you'll need to multiply them.
I assume you mean, with different denominators. If you want to add the fractions, subtract them, or compare them (determine which one is greater), you have to convert them to similar fractions (fractions with the same denominator) first. Converting to similar fractions is not necessary, and usually doesn't even help, if you want to multiply or divide fractions.
Quadratic equation
Change each fraction to an equivalent fraction with the same denominator. 3/8+5/12= 9/24+10/24=19/24