Unit 1:  Addition and Subtraction

Time Frame:  30 Days

 

 

Math > Grade 3 > Unit 1

 

Unit Description

Students will solve problems that involve comparison-for example, finding the difference between two weights, between record-holding statistics and their own statistics, between handfuls of beans, and between the number of school days and non-school days in a year. They also do problems in which they determine how amounts of time, money, and measurement are combined. Emphasis throughout is placed on students developing their own addition and subtraction strategies that make sense to them. Students are encouraged to use estimation and multiple strategies to double-check their work. Students will develop procedures that they can rely on because they are based on understandings about numbers and number relationships. The unit also includes number games and problems that build students’ fluency with using hundreds as important landmarks in combining and comparing.

 

Enduring Understandings

·         There is more than one way to solve a problem.

·         Addition is the opposite of subtraction.

·         Some problems require exact answers while others need only an estimate.

·         I can collect and organize information to help me understand numbers.

 

 

Essential Questions

·         How can I solve the same problem in more than one way?

·         How can I use addition to help me with subtraction?

·         How can I use subtraction to help me with addition?

·         How do I know when to estimate and when to use an exact answer?

·         Why is collecting and organizing information important in helping me understand numbers?

 

GLEs: 1, 2, 3, 8, 10, 11, 12, 13, 14, 17, 19, 21, 24, 25, 28, 30, 42, 43, 46, 47

Students will know…

·         Addends

·         Sum

·         Fact family

·         Difference

·         Estimate

·         Rounding

·         Overestimate

·         Underestimate

·         Regroup(ing)

·         Add and subtract numbers of 3 digits or less

·         Line plot(s)

 

 
Students will be able to…

·         Compare  numbers and develop strategies for determining their difference

·         Use landmark numbers to compare two quantities

·         Combine numbers and develop strategies for determining sums

·         Use estimation to make good approximations

·         Predict, collect, record, graph, and interpret data

·         Examine how parts and the whole are related in addition and subtraction

·         Combine/compare numbers using a variety of methods to solve real-life problems

Assessments

·       Performance Task

·       Performance Task – Rubric

·       Performance Task – Recording

·       Performance Task – Paper

·       Performance Task – Decoration

·       Performance Task – Prize

·       Performance Task – Refreshment

 

 

 

 

 

·       EDC Sample Assessment

·       Addition / Subtraction Problems

·       Equation Number Tiles

·       Fact Family

·       Multiplication / Division Problems

·       Assessment Task – 9

·       Assessment Task – 33

·       Assessment Task – 34

·       Assessment Task – 35

·       Assessment Task – 36

·       Task Checklist