2 Math Unit 9 Overview

2 Math Unit 9 Overview

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2nd Grade Unit 9: / Addition and Subtraction With and Without Regrouping / Suggested Time Frame: / 21 days
TAKS Objectives: / 1 / TEKS: / 2.3B,2.3C
Unit Overview
Do we borrow or do we carry? The problem can seem quite scary. As we move from ones to tens, adding and subtracting become our friends.
Enduring Understandings
  • When adding, each place can only hold one digit.
  • When adding and subtracting large numbers one must follow a step by step plan.
  • Understanding place value will helps mathematicians to add or subtract two digit numbers.
  • When adding or subtracting regroup only when necessary.
/ Essential Questions
  • When is regrouping necessary?
  • Why have a step-by-step plan for addition and subtraction with regrouping?
/ Mathematics Skills/Process
2.12Underlying processes and mathematical tools. The student applies Grade 2 mathematics to solve problems connected to everyday experiences and activities in and outside of school. The student is expected to:
2.12Aidentify the mathematics in everyday situations;
2.12Bsolve problems with guidance, that incorporates the process of understanding the problem, making a plan, carrying out the plan, and evaluating the solution for reasonableness
Including
  • Use manipulatives to represent problem situations.
  • Encourage different ways to solve a problem.
  • Have students verbalize observations.
2.12Cselect or develop an appropriate problem-solving plan or strategy including drawing a picture, looking for a pattern, systematic guessing and checking, or acting it out in order to solve a problem
Including
  • Encourage different ways to solve a problem
2.12Duse tools such as real objects, manipulatives, and technology to solve problems.
2.13Underlying processes and mathematical tools. The student communicates about Grade 2 mathematics using informal language. The student is expected to:
2.13Aexplain and record observations using objects, words, pictures, numbers, and technology; and
2.13Brelate informal language to mathematical language and symbols.
2.14Underlying processes and mathematical tools. The student uses logical reasoning.
2.14AThe student is expected to justify his or her thinking using objects, words, pictures, numbers, and technology.
(Ask: “How do you know that is the answer? If someone said they didn’t think it was right, how could you convince them?”)
Facts
  • Understand when regrouping is necessary with two-digit numbers.
  • Determine when a step by step plan for addition and subtraction with regrouping is necessary.
/ Relationships and/or Connections that should emerge
  • Regrouping in addition and subtraction is not always necessary.
  • Starting in the ones place will help to determine if regrouping is necessary.

Products students will develop
  • A picture problem from MLC; Volume 2, Unit 5, Presents and Parcels Story Problem
  • MLC; Blackline 5.17, Handfuls of Treasure

Language of Instruction
borrowing
ones
regrouping
renaming
tens
trading
two digit / Mathematical Connections to Literature
Alexander Who Used to be Rich Last Sunday
By Judith Viorst
Arthur’s Funny Money
By Lillian Hoban
17 Kings and 42 Elephants
By Margaret Mahy
2nd GradeUnit 9: / Addition and Subtraction With and Without Regrouping / Suggested Time Frame: / 21 days
TAKS Objectives: / 1 / TEKS: / 2.3B,2.3C
Unit Overview
Do we borrow or do we carry? The problem can seem quite scary. As we move from ones to tens, adding and subtracting become our friends.
Text Resources
Investigations
Putting Together and Taking Apart
MathLearningCenter
Volume 2
Silver Burdett Ginn
Motivation Math
Math Essentials
Vocabulary Adventure / Technology & Electronic Resources

(students will need pencil/paper for this website)
Other(i.e., Speakers, Field Trips) / Method(s) of Assessment
Observation
AObservation evaluated by peers
BStudents engaged in learning activities
CDirect questioning
DObservation of performance or process
Constructed Response
  1. TEKSCheck
Assessment Sourcebook: End-Of Unit Assessment Tasks
  1. Open-ended
  2. Essay
  3. Research Paper
  4. Log / Journal
  5. Story / Play / Poem
  6. Model / Map / Video
  7. Oral / Visual / Multimedia Presentation
Selected Response
1Fill-in-the-blank test
2Matching test
3Multiple choice test
4True/False test
MLC, Volume 2, Unit 4, Blackline 4.40-4.43
Collaborative Student Explorations
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Second Grade Mathematics Unit 9 Overview

In this brief summary, the dates will fluctuate according to your students, calendar, and special events.

Systems

Unit Nine: Addition/Subtracton with and without Regrouping

Suggested 21 days

  • 2-digit addition with and without regrouping
  • 2-digit subtraction with and without regrouping

8/27/2007DRAFT 3

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