Adding and Subtracting Mixed Numbers

Lesson Frame:

• We will add and subtract mixed numbers.
• I will add and subtract mixed numbers.

Interactive Notebook

Today we added three pages to our journal:

• Changing Mixed Numbers to Improper Fractions
• Changing Improper Fractions to Mixed Numbers
• Adding/Subtracting Mixed Numbers

When teaching changing mixed numbers to improper fractions, I use MAD (Multiply, Add, Denominator):

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There isn't any fun kind of mnemonic device... just divide!

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When working through adding and subtracting mixed numbers, I used templates 12 and 14 from:

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In the process of adding and subtracting mixed numbers, we included the following steps:

• Creating equivalent fractions to create common denominators
• We converted mixed numbers to improper fractions.
• We may have needed to use the Butterfly method.
• We converted improper backed to mix.
• We looked at our mixed numbers to determine if we could simplify, which included using
• divisibility rules
• prime numbers and multiples
• common factors.

Think Through Math

With the remaining 15 minutes in each class, we spent time on Think Through Math.