Unlike Denominators Math Games

In this series of games, your students will learn to add and subtract fractions with unlike denominators by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. The Unlike Denominators learning objective — based on CCSS and state standards — delivers improved student engagement and academic performance in your classroom, as demonstrated by research. This learning objective directly references 5.NF.A.1 as written in the common core national math standards.

Scroll down for a preview of this learning objective’s games and the concepts.

Concepts Covered

In order to add or subtract fractions, the denominators (or size of the parts of a whole) need to be the same size. Finding the equivalent fractions with common denominators does not change the value of either fraction. In order to add or subtract fractions with unlike denominators, you must find equivalent fractions with the same denominator. To find equivalent fractions, you must multiply by a fraction that is equal to one whole. Once equivalent fractions are made, only the numerators are added or subtracted. The denominators remain the same for the sum or difference of the fractions. In order to add or subtract fractions, both fractions will need to be changed to have common denominators.

Finding the Least Common Denominator (LCD) and then multiplying by the appropriate factor is acceptable but not necessary. Simplifying the sum or difference to be in lowest terms is not necessary. Fractions can be proper, improper (greater than one whole), or mixed numbers for addition or subtraction. Understanding that the size of units changes by creating equivalent fractions. Use visual fraction models, number lines, or equations to demonstrate thinking and solving of fractional addition and subtraction. Add fractions with unlike denominators. Add mixed numbers with unlike denominators. Subtract fractions with unlike denominators. Subtract fractions with unlike denominators.

A preview of each game in the learning objective is found below.

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