Curriculum / Math / 3rd Grade / Unit 1: Rounding, Addition, and Subtraction / Lesson 2

Rounding, Addition, and Subtraction

Lesson 2

Math

Unit 1

3rd Grade

Lesson 2 of 14

Objective

Represent three-digit numbers using concrete manipulatives and drawings, including cases with more than 9 of any unit.

Lesson Map

Topic A: Foundations of Place Value

Lesson

Use counting, place value understanding, and addition/subtraction of ones and tens to complete a partially filled-in number grid.

Standards

3.NBT.A.13.NBT.A.2

Lesson

Represent three-digit numbers using concrete manipulatives and drawings, including cases with more than 9 of any unit.

Standards

3.NBT.A.13.NBT.A.2

Lesson

Locate three-digit numbers on a number line and explain their placement.

Standards

3.NBT.A.1

Topic B: Rounding to the Nearest Ten and Hundred

Lesson

Define estimation and its purpose. Round two-digit numbers to the nearest ten using a number line.

Standards

3.NBT.A.1

Lesson

Round three-digit numbers to the nearest hundred using a number line.

Standards

3.NBT.A.1

Lesson

Round three-digit numbers to the nearest ten using a number line.

Standards

3.NBT.A.1

Lesson

Round multi-digit numbers to any place in more complex cases, including those involving real-world contexts and/or assessing the reasonableness of that estimate.

Standards

3.NBT.A.1

Topic C: Addition and Subtraction Within 1,000

Lesson

Add numbers with up to one composition within 1,000.

Standards

3.NBT.A.2

Lesson

Add numbers with multiple compositions within 1,000.

Standards

3.NBT.A.2

Lesson

Solve one-step word problems involving addition, using rounding to assess the reasonableness of answers.

Standards

3.NBT.A.13.NBT.A.23.OA.D.8

Lesson

Subtract numbers with up to one decomposition within 1,000.

Standards

3.NBT.A.2

Lesson

Subtract numbers with multiple decompositions within 1,000.

Standards

3.NBT.A.2

Lesson

Solve one-step word problems involving subtraction, using rounding to assess the reasonableness of answers.

Standards

3.NBT.A.13.NBT.A.23.OA.D.8

Lesson

Solve one- and two-step word problems involving addition and subtraction, using rounding to assess the reasonableness of answers.

Standards

3.NBT.A.13.NBT.A.23.OA.D.8

Bring Fishtank
to Your School

New Math Materials Now Live!

Now Live: All new Grade 1 units and enhanced Grade 7-8 materials. Coming soon: Brand new Kindergarten course and enhanced Grade 6!