# Which decimal part of 225 is 153

## fractii.ro

There are two cases that concern the denominator when we add ordinary fractions:

• A. The fractions have the same denominator;
• B. The fractions have different denominators.

### A. How do I add ordinary fractions with the same denominator?

• Just add up the fractions' counters.
• The denominator of the resulting fraction will be the common denominator of the fractions.
• Shorten the resulting fraction.

### An example of adding ordinary fractions with the same denominator. Explanations

• #### 3/18 + 4/18 + 5/18 = (3 + 4 + 5)/18 = 12/18;

• We just added the numerators of the fractions: 3 + 4 + 5 = 12;
• The denominator of the resulting fraction is: 18;

### B. If you want to add fractions with different denominators, you need to name them the same so that their denominators match. how is it done?

• #### 3. Calculate the expansion number for each fraction:

• The expansion number is the non-zero number used to multiply the numerator and denominator of each fraction to bring all of the fractions to the same common denominator.
• Divide the least common multiple (LCM) calculated above by the denominator of each fraction to find the expansion number of each fraction.
• #### 4. Expand each fraction:

• Multiply the numerator and denominator of each fraction by its expanded number.
• At this point, fractions are brought to the same denominator.
• #### 5. Add the fractions:

• To add all of the fractions, just add all of the fractions' counters.
• The resulting fraction has as its denominator the least common multiple, lcm, which was calculated above.