Curriculum / Math / 2nd Grade / Unit 5: Adding and Subtracting Within 1,000 / Lesson 8
Math
Unit 5
2nd Grade
Lesson 8 of 25
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Lesson Notes
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Use place value drawings to add within 1,000 with up to two compositions of a new unit.
I can use place value drawings to model addition within 1,000 with making a new ten and hundred.
The core standards covered in this lesson
2.NBT.B.6 — Add up to four two-digit numbers using strategies based on place value and properties of operations.
The foundational standards covered in this lesson
1.NBT.B.2 — Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
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
5-10 minutes
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Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
15-25 minutes
Solve using a place value chart to help.
a. 195 + 89 =
b. 327 + 258 =
c. 275 + 425 =
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Draw a place value drawing to solve. Record your answers.
a. 820 + 180 =
b. 912 + 88 =
c. What is another way that you could make 1,000?
Solve using a place value drawing to find the solution.
a. _____ - 509 = 375
b. _____ = 117 + 745
c. 455 + 378 = _____
d. _____- 187 = 734
15-20 minutes
A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
a. 194 + 275 = _____
Did you make a new ten? Explain your thinking.
Did you make a new hundred? Explain your thinking.
b. 458 + 346 = _____
Daily Word Problems, Warm Ups, and Center 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.
Next
Use expanded form to add within 1,000.
Topic A: Adding with Mental Strategies
Mentally add 10 and 100 to numbers within 1,000.
Standards
2.NBT.B.8
Add multiples of 10 and 100 to numbers within 1,000.
2.NBT.B.72.NBT.B.8
Use the associative property to make a multiple of 100 or multiple of 10 to add.
2.NBT.B.7
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Topic B: Adding within 1,000
Use concrete manipulatives to add within 1,000.
Use concrete manipulatives to add within 1,000 with up to one composition.
Use concrete manipulatives to add within 1,000 with up to two compositions.
Use place value drawings to add within 1,000 with up to one composition of a new unit.
2.NBT.B.6
Relate addition with place value drawings to algorithms in situations with up to two compositions of a new ten or hundred.
Topic C: Subtracting with Mental Strategies
Mentally subtract 10 and 100 from numbers within 1,000.
Subtract multiples of 10 and 100 from numbers within 1,000.
Use constant difference to subtract by subtracting multiples of ten or a hundred.
Topic D: Subtracting within 1,000
Use concrete manipulatives to subtract within 1,000 with no decompositions.
Use concrete manipulatives to subtract within 1,000 with up to one decomposition.
Use concrete manipulatives to subtract within 1,000 with up to two decompositions.
Use place value drawings to subtract within 1,000 with up to one decomposition.
Use place value drawings to subtract within 1,000 with up to two decompositions.
Use expanded form to subtract within 1,000.
Relate subtraction with expanded form to the standard algorithm in situations with up to two decompositions of a ten or hundred.
Topic E: Story Problems and Explaining Addition and Subtracting Thinking
Solve one-step word problems using strategies to solve within 100.
2.NBT.B.52.OA.A.1
Solve two-step word problems using strategies to solve within 100.
Solve addition computations within 1,000 and explain strategies.
2.NBT.B.62.NBT.B.72.NBT.B.9
Solve subtraction computations within 1,000 and explain strategies.
2.NBT.B.72.NBT.B.9
Solve and explain strategies when adding and subtracting within 1,000.
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