# Lesson

5.13. Finding the Common Denominator of Fractions with Different Denominators

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# 5.13. Finding the Common Denominator of Fractions with Different Denominators

**Adding and subtracting fractions 5.**

We are making the task more difficult. Here, as opposed to the previous preparatory chapter, the internal arithmetic structure of the denominators of the fractions will not be visible. Now you have to examine the denominators and find out which of the previous three methods must be used to find the common denominator of the fractions. Furthermore, after finding the common denominator, you also have to simplify the fraction.

## Templates:

# Key transformations:

## 1st examination

## Case A:

### Example A.:

## 2nd examination

## Case B.

### Example B/1.:

### Example B/2.

## Case C.

### Example C/1.:

### Example C/2.

# Easy

- 1.
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- 3.

# Intermediate

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# Hard

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- 11.