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#### Description:

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: To add fractions, we usually first find a common denominator. Find two different common denominators for $\frac{1}{5}$ and $\frac{1}{15}$. Use each com...

#### Subjects:

• Mathematics > General
• Education > General

#### Keywords:

Informal Education,NSDL,Upper Elementary,Grade 5,oai:nsdl.org:2200/20130211105438533T,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-103,Elementary School,Vocational/Professional Development Education,Mathematics,Education

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Update Standards?

#### CCSS.Math.Content.5.NF.A.1: Common Core State Standards for Mathematics

Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators.
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