McSperrin-Math‎ > ‎

Tuesday, December 12, and Wednesday, December 13

posted Jan 1, 2018, 7:30 PM by Kristin Becker
Math 6: 
Today we worked on subtracting fractions with regrouping.  Students have two options for regrouping fractions when they are unable to subtract the second fraction from the first.  

The first option is to borrow 1 from the whole number.  We trade the whole for the fractional pieces. Then we can subtract.  In the following problem the second fraction is greater than the first so we are unable to subtract it as written.

Image result for subtracting fractions with regrouping
The second option is to regroup by changing both mixed numbers to improper fractions. 

Image result for subtracting fractions by changing to improper fractions

A final step for both options is to simplify the fractions.

Watch the videos below for additional practice.

Subtracting Fractions by Borrowing

Subtracting Fractions and Mixed Numbers by Renaming as an Improper Fraction