Adding & Subtracting Mixed Numbers

What?

4.NF.B.3c Add and subtract mixed numbers with like denominators by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.

4.NF.B.3d Solve contextual problems involving addition and subtraction of fractions referring to the same whole and having like denominators.

4.MD.B.4 Make a line plot to display a data set of measurements in fractions of a unit (1/2, 1/4, 1/8). Use operations on fractions for this grade to solve problems involving information presented in line plots. For example, from a line plot find and interpret the difference in length between the longest and shortest specimens in an insect collection.. Represent and interpret data.

WHY? In this unit students will use their understanding of adding and subtracting fractions and generating equivalent fractions to solve problems involving fractions and mixed numbers. Students rely on their previous work with whole numbers as fractions to compose and decompose whole numbers into fractional quantities. Data is used in this unit to support students’ understanding of fractional quantities both smaller and larger than 1. This is students first time to compute mixed numbers so much time with concrete and pictorial representations connected to the equation will be needed.