11/2/2009 Unit 4: Students will solve change-to-more number stories and part-and-total number stories. They will explore reading temperatures on a thermometer, practice finding the total value of a group of coins, and develop readiness for classifying geometric shapes. Students will read and show temperatures and solve number stories about temperature. They will use estimation to solve problems for which an exact answer is not necessary, and they will develop strategies for adding 2-digit numbers mentally. Students will measure lengths and distances  to the nearest inch and centimeter. Students will also develop paper-and-pencil strategies for adding 2- and 3- digit numbers and be introduced the partial-sums addition algorithm.