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# Related denominators / Adding and subtracting / Good.

When adding fractions with the same/related denominators, all you have to do is add the numerators. The reason why you keep the denominators the same is because the total size of the pieces denominator never changes. Here’s the traditional way to add fractions with two different denominators:Find the LCM of the two denominators. Suppose you want to add the fractions 3/47/10.Increase the terms of each fraction so that the denominator of each equals the LCM.Substitute these two new fractions for the. Working with related denominators is preparation for establishing a general strategy for making common denominators when adding and subtracting fractions with unrelated denominators. Students need time to develop an understanding of the processes involved in addition and subtraction of fractions, particularly for establishing the need for the denominators to be the same in order to. Jan 03, 2018 · In this game, students practice subtracting fractions with like denominators and then annihilate a piece of fruit. You can choose if the fruit go fast.