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?

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

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

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

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

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