Lesson 2

Partition Shapes

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X
  1. No
  2. No
  3. 300; If 172 were 175, the sum would be 300. Since 172 is a little less than 175, the sum must be a little less than 300.

E. Number Sense

Use base-ten pieces and a 200 Chart to estimate.

172 + 125 =

  1. Is the answer between 150 and 250?
  2. Is the answer more than 300?
  3. Is the answer closer to 200, 275, or 300? Show or tell how you know.