Add and subtract fractions with like denominators
Train Game
Description Students randomly grab a handful of relational rods from a paper (opaque) bag. They build a linear train with all of the rods they have selected. Keeping a denominator of 10 (the length of the orange relational rod, which is the whole), they then determine the length of the train by adding up all the fractional quantities. 

Mathematics Using relational rods, students add various fractional quantities where the whole has a denominator of 10. This is an entry point to adding fractions with like denominators that pushes students to think about fractions larger than one whole. This task also supports later development of multiplication with fractions as repeated addition; for example, students may have 3 red lengths (each representing twotenths) and can unitize to consider 3 x
2
10
6
10


Curriculum Connections Students will:


Instructional sequence


Highlights of student thinking Students may:

Key questions


Materials

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To download a copy of this .pdf, click here.
Developing Fraction Number Sense
Purposeful Representations
Developing Proficiency with Partitioning, Iterating and Disembedding
Building Understanding of Unit Fractions
Building to Addition and Subtraction of Fractions
Foundations to Learning and Teaching Fractions: Addition and Subtraction (Literature Review)