Subtracting Fractions (Unrelated Denominators)

Module 7, Lesson 3

Differentiation Activity

Students can print the multiplication table, cut it into strips, and use it to find common multiples. For example, I drew 1/3 and found the strips that made 1/3 with the beginning number.  I did the same for the 2/4 that I drew.  When looking at the two sets of strips, I was able to highlight the common denominator. After students draw their cards, they will find the difference between the two fractions.  Students score points depending on the number of denominators they had to change to calculate their difference (see Extra Help Slides for Scoring Rules.) The students will explain their thinking either in a notebook or on a whiteboard. 

Click for full description of activity and to download the Extra Help Slides (Scoring Rules). 
Multiplication Table
Fraction Cards
Recording Sheet

Subtracting Fractions (Related Denominators)

5.NF.1
Module 7
Differentiation Activity

Partners will each draw two cards and find the difference between the two fractions.  They may use the number line to help.  If the student can correctly find the difference, they are awarded 1 points if their fractions had the same denominator or two points if they had related denominators.  After five rounds, the student with the most points is the winner.

Fraction Cards
Number Line Fifths
Recording Sheet

Subtracting Fractions (Like Denominators)

5.NF.1
Module 7
Differentiation Activity

Each partner will draw two cards.  They must find the difference between the two fractions. They may use the number line for help. They will record the difference on the recording sheet and the partner with the greatest difference receives a point.  The partner with the most points after five rounds is the winner.

Number Line
Fraction Cards
Recording Sheet

Improper Fractions and Mixed Number Equivalents

5.NF.1
Module 4

Student can use the cards to play memory or other mix and match games.  They can also use the cards to add and subtraction fractions.

Fraction Cards