How to Use Models to Decompose Fractions into Unit Fractions?
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A Step-by-step guide to using models to decompose fractions into unit fractions
Unit fractions are rational numbers written down as fractions where their numerator is \(1\) and their denominator is a positive integer.
Decomposing fractions into unit fractions can be a helpful way to break down more complex fractions into simpler components. A unit fraction is a fraction where the numerator is 1, and the denominator is a positive integer. Here’s a step-by-step guide to using models to decompose fractions into unit fractions:
Step 1: Choose the fraction to decompose
Select the fraction you want to decompose. For this example, let’s use \(\frac{3}{4}\).
Step 2: Create a model
Draw a rectangle or circle to represent the whole. For our example, we’ll draw a rectangle. Divide the rectangle into equal parts based on the denominator of the fraction (in this case, 4 parts). Shade the number of parts equal to the numerator (in this case, shade 3 parts).
Step 3: Identify unit fractions
Now that you have a visual representation of the fraction, you can see that each part represents a unit fraction. In our example, each part represents \(\frac{1}{4}\), since the rectangle is divided into 4 equal parts.
Step 4: Write the decomposition
Write the decomposition of the fraction as the sum of the unit fractions that make it up. In our example, we have: \(\frac{3}{4} = \frac{1}{4}+ \frac{1}{4} + \frac{1}{4}\)
Step 5: Confirm the result
Make sure that the sum of the unit fractions equals the original fraction. In our example, we can see that \(\frac{1}{4} + \frac{1}{4} + \frac{1}{4} = \frac{3}{4}\), confirming that our decomposition is correct.
Keep in mind that there can be multiple valid decompositions for a given fraction. For example, \(\frac{3}{4}\) can also be decomposed into \(\frac{1}{2} + \frac{1}{4}\), as both of these unit fractions sum to the original fraction. Models can help you visualize and understand different ways to decompose fractions into unit fractions.
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