When adding or subtracting fractions, you need to look at the denominator. If the denominator is the same, then you can just add or subtract the numerator. If the denominator is different, then ...

Another common struggle: the parts-of-a-whole problem. Fractions are introduced through the “pizza model,” but students’ ...

In adding and subtracting fractions with unlike denominators, you have to get a least common denominator which is exactly like the least common multiple it just so happens to be in the denominator.

In fourth grade, students focus most on using all four operations - addition ... (the numerators and denominators) are different. Recognize and create equal (equivalent) fractions – for example ...

They will grapple with this idea of combining fractions with two different denominators a lot better ... and combine with an operation [like addition]. When it comes to multiplying or dividing ...