Adding Fractions –
Framework for Learning:
Leader’s Name: ………………………………….
The Lowest Common Denominator
Co-Leader’s Name: ………………………………
Instructor’s Initials: ………
Getting Started:
List the first six multiples of 3 and 4 below. Circle the least common multiple of the two numbers.
Multiples of 3: _____, _____, _____, _____, _____, _____
Multiples of 4: _____, _____, _____, _____, _____, _____
Compare your answers with a partner. Discuss and correct any mistakes.
Log into UMATH X
From the menu on the left:
Hover over the Strand: Fractions
Hover over Section 8: Adding Fractions
Hover over the Lesson: The Lowest Common Denominator
Select and complete the Sub Lessons: Example 1
Example 2
As you work through the lessons, complete the corresponding notes below.
Example 1
Example 2
The lowest common denominator
The lowest common denominator
of ⅓ and ¼ is _____.
of
and
is _____.
Discuss the steps for adding fractions with unlike denominators with a partner. Write a summary of
your discussion below.
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Working In It:
Calculate the sum for each of the following. Show all work. Write final answers in lowest terms.
Practice 2
Practice 1
Does the lowest common denominator always
have to be used to calculate the sum of fractions
with unlike denominators? Explain.
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Practice 3
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Reflect & Connect:
Brainstorm ways least common multiple and greatest common factor are used to calculate the sum
of fractions with unlike denominators. Discuss your observations with a partner. Write a paragraph
summarizing your discussion below. Justify your answer with examples from the problems completed in
this Framework.
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