The document discusses how teachers in the Arlington school district are preparing for the Common Core State Standards in mathematics. It outlines professional development days where teachers learned about the new standards and requested additional supports. Moving forward, teachers will receive in-service courses, revised materials, and individualized support through grade-level meetings and coaching to emphasize multiple strategies and modeling in mathematics instruction as required by the Common Core.

1. Common Core Standards in Mathematics How are Arlington teachers preparing? Dawn Galente, ACSD Curriculum Supervisor in Mathematics

8. Modeling

9. 5.NF.4 Multiplying a Whole Number by a Fraction can be thought of as 4 groups of 2/3… can be thought of as ½ of a group of 1/3… 2 3 x 4 8 3 = 1 2 1 3 x 1 6

10. 5.NF.3 Fractions as Division- 3 candy bars, 4 people- how much does each get? If you split each bar into the number of shares needed, this works easily… Each person gets 3 x ¼, or ¾ of a bar.

11. 5.NF.7 Division of a unit fraction How can I share 1/3 of a candy bar with 4 people? That 1/3 section must be broken into 4 pieces. But to find the size of each piece, the whole needs to be broken into equal pieces. 1 3 ÷ 4 There are 12 in all. So 1 3 ÷ 4 is 1/12.