Subtracting Fractions with Modeling Techniques

In this video, the teacher explains how to subtract fractions using area models. The process involves ensuring the denominators are the same, drawing area models for each fraction, and adjusting these models to reflect the subtraction. The teacher uses the example of two-thirds minus one-fourth, demonstrating how to split the models into equal parts and calculate the result. The video concludes with a reminder to practice the method at home.

Why is it important for the denominators to be the same when subtracting fractions?

• To avoid confusion

• To ensure the fractions can be subtracted directly

• To make the fractions look similar

• To make the numerators equal

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the first step in subtracting two-thirds and one-fourth?

• Add the fractions

• Draw area models for each fraction

• Convert the fractions to decimals

• Multiply the fractions

Tags

CCSS.7.NS.A.1C

How many parts should the area model for two-thirds be split into?

• Three equal parts

• Five equal parts

• Two equal parts

• Four equal parts

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

How many parts should be shaded in the area model for two-thirds?

• Three parts

• One part

• Two parts

• Four parts

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

What is the next step after drawing and shading the area models for two-thirds and one-fourth?

• Multiply the fractions

• Convert the fractions to decimals

• Split the fractions into parts by the opposite denominators

• Add the fractions

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

How many parts should the two-thirds fraction be split into?

• Four parts

• Five parts

• Three parts

• Two parts

Tags

CCSS.1.G.A.3

How many parts should the one-fourth fraction be split into?

• Five parts

• Four parts

• Three parts

• Two parts

Tags

CCSS.1.G.A.3

What do you do after splitting the fractions into parts by the opposite denominators?

• Add the fractions

• Multiply the fractions

• Subtract the shaded parts from the first model

• Convert the fractions to decimals

Tags

CCSS.4.NF.B.3A

How many shaded parts are left after subtracting in the example problem?

• Five parts

• Four parts

• Three parts

• Six parts

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

What is the denominator in the final answer of the example problem?

• Eight

• Ten

• Fourteen

• Twelve

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B