Curriculum / Math / 3rd Grade / Unit 1: Rounding, Addition, and Subtraction / Lesson 2
Math
Unit 1
3rd Grade
Lesson 2 of 14
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Represent three-digit numbers using concrete manipulatives and drawings, including cases with more than 9 of any unit.
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.
3.NBT.A.2 — Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
The foundational standards covered in this lesson
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.3 — Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
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
256 is a number.
a. Build the number 256 with base ten blocks or draw a picture to represent it.
b. Write it as a sum of 100’s, 10’s, and 1’s.
c. Write it in unit form.
Looking at Numbers Every Which Way, accessed on July 31, 2017, 9:51 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.
Ivette wants to model the number 438 with base ten blocks, but she only has 2 tens rods. She has lots of hundreds and ones blocks. How can she make this number using the blocks she has?
Three Composing/Decomposing Problems, accessed on Sept. 25, 2018, 12:39 p.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.
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
What number is modeled on the place value chart below?
Find another way to model the same number on the place value chart below.
An example response to the Target Task at the level of detail expected of the students.
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.
Lesson 1
Lesson 3
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
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.
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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