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

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 ...

you can add them together by adding the numerators. However, sometimes the denominators are different. You use equivalent fractions to make them the same. A common multiple of 2 and 3 is 6.