Math: Adding and Subtracting Fractions
In Module 1, money and clocks serve to help students develop intuitions about finding common denominators in order to compare, add, and subtract fractions. In Module 2, students are introduced to the use of double number lines and ratio tables to rewrite fractions with common denominators. In Module 3, they extend these strategies and models to solving a variety of story problems, and make generalizations about finding common denominators. Module 4 gives students more explicit experience with greatest common factors and least common multiples as they find common denominators and learn to simplify fractions.
Each module will last approximately 4-5 days and an overview of the unit (with some diagrams and examples) should have come home with your student’s homework today.
To give students additional practice and experience with fractions, here are some online game resources that you might like to try out:
Frosty Fractions: http://www.counton.org/games/map-fractions/frosty/
Fraction Tracks: http://illuminations.nctm.org/activity.aspx?id=4148
Calculation Nation also has a variety of fraction games for students to master. Follow this link to access the games. No registration or password is needed; just click the orange “guest pass” button in the lower left corner. Some games that your student might enjoy include: Dig It, Drop Zone and Fraction Feud.
Fraction Flip Books In the Works!
One of the larger projects in our fraction unit has us creating a trail map. We are tasked with creating a map for a canoe enthusiast who would like to know how far she has made it alongside a 30 km trail. She knows that there are designated markers (such as camp sites, bathrooms, parks, etc.) at regular intervals. We create a map showing those measurements (in halves, thirds, fourths, fifths, sixths, twelfths and fifteenths). Stay tuned for more photos of our work.
Finding the Common Denominator
Adding and Subtracting Fractions (Khan Academy)
Equivalent Fractions (Khan Academy)