Subtracting mixed numbers unlike denominators regrouping

Front

What is a mixed number?

Back

A mixed number is a whole number combined with a fraction, such as 2 1/2.

Front

How do you subtract mixed numbers with unlike denominators?

Back

1. Convert mixed numbers to improper fractions. 2. Find a common denominator. 3. Subtract the fractions. 4. Convert back to a mixed number if necessary.

Front

What is regrouping in subtraction?

Back

Regrouping is the process of borrowing from the next highest place value to make subtraction easier.

Front

Convert 15 3/5 to an improper fraction.

Back

15 3/5 = 78/5.

Front

Convert 3 1/2 to an improper fraction.

Back

3 1/2 = 7/2.

Front

What is the first step in subtracting 15 3/5 - 3 1/2?

Back

Convert both mixed numbers to improper fractions.

Front

What is the common denominator of 5 and 2?

Back

The common denominator of 5 and 2 is 10.

Front

How do you convert 78/5 to a fraction with a denominator of 10?

Back

Multiply the numerator and denominator by 2: 78/5 = 156/10.

Front

What is 156/10 - 35/10?

Back

156/10 - 35/10 = 121/10.

Front

Convert 121/10 back to a mixed number.

Back

121/10 = 12 1/10.