Curriculum / Math / 3rd Grade / Unit 1: Rounding, Addition, and Subtraction / Lesson 3
Math
Unit 1
3rd Grade
Lesson 3 of 14
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Lesson Notes
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Locate three-digit numbers on a number line and explain their placement.
The core standards covered in this lesson
3.NBT.A.1 — Use place value understanding to round whole numbers to the nearest 10 or 100.
The foundational standards covered in this lesson
2.MD.B.6 — Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, …, and represent whole-number sums and differences within 100 on a number line diagram.
2.NBT.A.1 — Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
2.NBT.A.2 — Count within 1000; skip-count by 5s, 10s, and 100s.
The essential concepts students need to demonstrate or understand to achieve the lesson objective
Suggestions for teachers to help them teach this lesson
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Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
25-30 minutes
a. What do you notice? What do you wonder?
b. Determine the value of the point on each number line in Part (a) above.
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Three-digit Numbers on the Number Line, accessed on June 6, 2022, 10:14 a.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.
a. Label each point with the value it represents.
b. Locate and label each number on the number line. Label the intervals with the numbers they represent if it helps.
a. Plot 55 on a number line from 50 to 60.
b. Plot 55 on a number line from 0 to 100.
c. Plot 55 on a number line from 0 to 1,000.
15-20 minutes
Problem Set
A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
5-10 minutes
Determine the value of the number shown on the number line below.
Show two different ways to show 285 on a number line.
The Extra Practice Problems can be used as additional practice for homework, during an intervention block, etc. Daily Word Problems and Fluency Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.
Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.
Next
Define estimation and its purpose. Round two-digit numbers to the nearest ten using a number line.
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.
3.NBT.A.1
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Topic B: Rounding to the Nearest Ten and Hundred
Round three-digit numbers to the nearest hundred using a number line.
Round three-digit numbers to the nearest ten using a number line.
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 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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