Adding and Subtracting Fractions with unlike denominators( TM)

Front

What is the first step in subtracting fractions with unlike denominators?

Back

Find a common denominator.

Front

What is the least common denominator (LCD) of 1/4 and 1/3?

Back

12

Front

How do you subtract the fractions \( \frac{3}{4} - \frac{2}{10} \)?

Back

Convert to a common denominator and then subtract the numerators.

Front

What is the result of \( \frac{19}{20} - \frac{3}{10} \)?

Back

\( \frac{13}{20} \)

Front

What is the result of \( \frac{8}{9} - \frac{5}{6} \)?

Back

\( \frac{1}{18} \)

Front

What is a common denominator?

Back

A common denominator is a number that is a multiple of the denominators of two or more fractions.

Front

Why is it necessary to find a common denominator when adding or subtracting fractions?

Back

It allows you to combine the fractions by ensuring they are expressed in terms of the same unit.

Front

What is the process to find the least common denominator (LCD) of two fractions?

Back

List the multiples of each denominator and find the smallest multiple they have in common.

Front

If the fractions are \( \frac{a}{b} \) and \( \frac{c}{d} \), how do you find the common denominator?

Back

The common denominator is typically \( b \times d \) or the least common multiple of \( b \) and \( d \).

Front

What is the formula for subtracting two fractions \( \frac{a}{b} - \frac{c}{d} \)?

Back

\( \frac{a}{b} - \frac{c}{d} = \frac{a \cdot d - b \cdot c}{b \cdot d} \)