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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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.
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
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
A coat costs $92. Mrs. Ingall says the coat is about $90. Mr. Silver says it is about $100. Who is correct, Mrs. Ingall, Mr. Silver, both of them, or neither of them? Explain your answer.
When a number is rounded to the nearest ten, it rounds to the lesser benchmark. When a number is rounded to the nearest hundred, it rounds to the greater benchmark. What might the number be?
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
Ms. Needham knows there are 283 students in Grades 3, 4, and 5 at Fishtank Learning Elementary School. She says that there are about 280 students.
a. Did Ms. Needham round to the nearest ten or hundred?
b. Ms. Needham rounded the number of Grade 3, 4, and 5 students to be able to set up seats in the gym for an assembly with those grades. Do you think Ms. Needham made a good decision about how she rounded the number of students? Why or why not?
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.
Extra Practice Problems
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Lesson 6
Lesson 8
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 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.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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