Curriculum / Math / 3rd Grade / Unit 1: Rounding, Addition, and Subtraction / Lesson 7
Math
Unit 1
3rd Grade
Lesson 7 of 14
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Lesson Notes
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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.
Topic A: Foundations of Place Value
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
Represent three-digit numbers using concrete manipulatives and drawings, including cases with more than 9 of any unit.
Locate three-digit numbers on a number line and explain their placement.
3.NBT.A.1
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Topic B: Rounding to the Nearest Ten and Hundred
Define estimation and its purpose. Round two-digit numbers to the nearest ten using a number line.
Round three-digit numbers to the nearest hundred using a number line.
Round three-digit numbers to the nearest ten using a number line.
Topic C: Addition and Subtraction Within 1,000
Add numbers with up to one composition within 1,000.
3.NBT.A.2
Add numbers with multiple compositions within 1,000.
Solve one-step word problems involving addition, using rounding to assess the reasonableness of answers.
3.NBT.A.13.NBT.A.23.OA.D.8
Subtract numbers with up to one decomposition within 1,000.
Subtract numbers with multiple decompositions within 1,000.
Solve one-step word problems involving subtraction, using rounding to assess the reasonableness of answers.
Solve one- and two-step word problems involving addition and subtraction, using rounding to assess the reasonableness of answers.
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