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iRubric: Adding and Subtracting Fractions  with Unlike Denominators rubric

iRubric: Adding and Subtracting Fractions with Unlike Denominators rubric

 
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Adding and Subtracting Fractions with Unlike Denominators 
MGSE5.NF.1 Add and subtract fractions and mixed numbers with unlike denominators by finding a common denominator and equivalent fractions to produce like denominators.
Rubric Code: U2266WB
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Public Rubric
Subject: Math  
Type: Assessment  
Grade Levels: K-5


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

0 pts

Emerging

2 pts

Proficient

3 pts

Find Common Denominators or LCD

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

Beginner

The student does not or does not know how to find the Common Denominator or LCD.
Emerging

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

The student fully understands and lists the multiples of the denominators, showing the Common Denominator or LCD 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.

Beginner

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

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

The student is able to make equivalent fractions from making the Common Denominator or LCD 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 the Fraction

The student is able to add the fractions with unlike denominators.

Beginner

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

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 only the numerator.
Proficient

The student fully understands that when the denominator is different, they need to make equivalent fractions. They find the new numerators/denominators and adds only the numerator. while the denominator stays the same.
Subtract the Fraction

The student is able to subtract the fractions with unlike denominators.

Beginner

The student does not know how to correctly subtract mixed numbers with unlike denominators.
Emerging

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 subtracts only the numerator. As well as subtract the whole numbers.
Proficient

The student fully understands that when the denominator is different, they need to make equivalent fractions. They find the new numerators/denominators and subtract only the numerator. while the denominator stays the same. As well as subtract the whole numbers.



Keywords:
  • Fractions

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