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iRubric: Adding/Subtracting Fractions rubric

iRubric: Adding/Subtracting Fractions rubric

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Adding/Subtracting Fractions 
The students have been working on all the concepts leading up to adding/subtracting fractions. Comparing fractions with unlike denominators, making equivalent fractions, simplifying fractions, and now adding/subtracting fractions
Rubric Code: R8C55C
By ebersmel
Ready to use
Public Rubric
Subject: Math  
Type: Assessment  
Grade Levels: K-5

Powered by iRubric Adding/Subtracting Fractions
The student has to put together all the skills they have learned to add/subtract fractions with unlike denominators.
  Poor

1 pts

Fair

3 pts

Good

5 pts

Find LCM of Denominators

The student is able to find the least common multiple of the fractions with unlike denominators.
Poor

The student does not or does not know how to find the LCM of the denominators.
Fair

The student somewhat understands the concept of listing the multiples of the denominators, but their work is not complete.
Good

The student fully understands and lists the multiples of the denominators, showing the LCM by circling it, or making it the fractions new denominator.
Make Equivalent Fractions

The student is able to make equivalent fractions from finding the LCM of the denominators.
Poor

The student does not know how change the fractions to equivalent fractions with the same denominators.
Fair

The student somewhat understands the concept of making equivalent fraction, but their understanding is not complete. They make may the new denominator the LCM but is not sure about how to get the new numerator.
Good

The student is able to make equivalent fractions from making the LCM of the unlike denominators the new denominators and then multiples the numerator by the same number they multiplied their old denominator by to get their new denominator.
Add/Subtract the Fraction

The student is able to add or subtract the fractions.
Poor

The student does not know how to correctly add or subtract the fractions with unlike denominators.
Fair

The student somewhat understands that when the denominator is different, they need to make equivalent fractions. They make an attempt to find the new numerators/denominators and adds or subtracts only the numerator.
Good

The student fully understands to add the new numerators together, while the denominator stays the same, as well as adding the whole numbers.
Simplify Fractions

The student is able to put fractions in its simplest form.
Poor

The student does not know or does not simplify fractions.
Fair

The student may somewhat understand to list the factors of the numerator and/or denominator. An attempt is made to find the common factors and divide the numerator/denominator by the common factors, but the factors may not be in simplest form.
Good

The student is able to list the greatest common factors of the numerator and denominator and then dividing the numerator and denominator by the GCF to come up with the most simplified version of the fraction.



Keywords:
  • Fractions

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