April 3, 2015
Objective: SWBAT........

This week, students conclude Number Worlds, Level E, Addition. Students will use variables to represent the unknown in one- and two-step addition problems and solve for the variables using subtraction.

• Students can solve for geometric shapes used as variables in equations.

3.OA.8 Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.

Vocabulary:

• Addition
• Double Fact
• Near Double Fact
• Nice Numbers
• Grouping
• Regrouping
• Partial Sum
• Carrying
• Equation
• Variable

Activity:  

• Warm-Up: Front- end estimation vs. Reference- point estimation
• One Shape Cover-up
• SWB pp.66-67

Debrief: 

• Exit Slip: Reflect question on page 67

Homework: None