Subtracting Mixed Number Fractions with Different Denominators Using Area Models

This lesson teaches how to subtract mixed number fractions with different denominators using area models. It begins with a review of subtracting fractions with common denominators and highlights common mistakes students make. The lesson then explains how to find a common denominator using area models to create equivalent fractions, allowing for subtraction. Two example problems are provided to illustrate the process, and the lesson concludes with a summary of the key points covered.

Can you explain why subtracting whole numbers, numerators, and denominators separately does not work?

What is the process to subtract mixed number fractions with different denominators?

How do you create equivalent fractions when subtracting mixed number fractions?

What steps would you take to model the subtraction of 3 and 1/2 minus 1 and 1/4?

Why is it important for the pieces to be the same size when adding or subtracting fractions?