Subtracting Mixed Numbers: Techniques and Strategies

This video tutorial covers lesson 7.8 on subtracting mixed numbers by renaming them as fractions greater than one. It explains how to handle cases where the fraction in the subtrahend is greater than in the minuend, and demonstrates converting mixed numbers to improper fractions for subtraction. The tutorial includes examples of subtracting mixed numbers from whole numbers, solving word problems, and using fraction strips for modeling. It also covers simplifying fractions and comparing heights, and concludes with a preview of the next lesson on addition properties.

What is the first step in subtracting mixed numbers when the fraction in the subtrahend is larger?

• Subtract the whole numbers first.

• Rename the minuend as a fraction greater than one.

• Add the fractions.

• Convert both numbers to improper fractions.

How do you rename a mixed number as a fraction greater than one?

• Subtract the numerator from the whole number.

• Add the whole number to the numerator.

• Divide the whole number by the denominator.

• Multiply the whole number by the denominator and add the numerator.

What is the result of subtracting 2 and 2/3 from 3 and 1/3?

• 1/3

• 2/3

• 1

• 1 and 2/3

How much longer did Tala play outside compared to Sujin?

• 1 hour

• 2/3 hour

• 1/3 hour

• 1 and 2/3 hours

What is the simplified form of 8/12?

• 1/2

• 4/6

• 2/3

• 3/4

Who is the tallest among Mr. Lee, Mr. Kim, and Miss Cho?

• Mr. Lee

• Mr. Kim

• Miss Cho

• They are all the same height.

What is the result of 27 fifths minus 9 fifths?

• 18/5

• 16/5

• 9/5

• 36/10

How do you simplify 18/5?

• 2 4/5

• 3 3/5

• 4 2/5

• 3 1/2

What is the correct way to subtract mixed numbers with large numerators?

• Rename both numbers as fractions greater than one.

• Only rename the minuend.

• Subtract without renaming.

• Convert to decimals and subtract.

What is the next lesson about?

• Dividing mixed numbers.

• Properties of addition with fractions.

• Multiplying mixed numbers.

• Properties of subtraction with fractions.