March 31, 2015
Objective: SWBAT........

This week, students continue Number Worlds, Level E, Addition. Students will explore when and why to estimate sums as well as several methods for estimation.

• Students can use rounding for estimating.

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
• Estimation
• Front- end estimation
• Reference- point estimation
• Rounding

Activity:  

• Warm-Up: Review Front- end and Reference- point estimation
• SWB pg. 58-59
• Rounding
• SWB pg.60-61

Debrief: 

• Discuss reflect question in SWB pg.61

Homework: Computational Estimation: Lesson 4