Curriculum / Math / 3rd Grade / Unit 1: Rounding, Addition, and Subtraction / Lesson 6
Math
Unit 1
3rd Grade
Lesson 6 of 14
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Round three-digit numbers to the nearest ten using a number line.
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:
The essential concepts students need to demonstrate or understand to achieve the lesson objective
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Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
a. Round 17 to the nearest ten.
b. Round 117 to the nearest ten.
c. What’s similar about Parts (a) and (b)? What’s different?
Round each of the following numbers to the nearest ten, using a number line if it would help you. Record your answer using the $$\approx$$ symbol.
a. 162
b. 215
c. 297
d. 803
Problem Set
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A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
Round each of the following numbers to the nearest ten. Show or explain your thinking.
a. $$594\approx $$ ________
b. $$245\approx$$ ________
c. $$628\approx$$ ________
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.
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Lesson 5
Lesson 7
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.
3.NBT.A.1 3.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 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.1 3.NBT.A.2 3.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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