Number & Operations in Base Ten
2.NBT.A.1
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- 2.NBT.A.1Understand 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.2Count within 1000; skip-count by 5s, 10s, and 100s.
- 2.NBT.A.3Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
- 2.NBT.A.4Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.
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2.NBT.A.1a
100 can be thought of as a bundle of ten tens — called a “hundred.”
5 Lesson(s)
Each Number Has a Place: Tens and Ones
2nd Grade Math »
Unit: Each Number Has a Place
2nd Grade Math »
Unit: Each Number Has a Place
Big Idea:
The big idea of this lesson is that the base-ten number system uses models to show numbers. The ones digit represents how many ones, and the tens digit represents how many groups of ten.
Standards:
Favorites
(67)
Resources
(15)
Reflections
(1)
Moving Along In Tens
2nd Grade Math »
Unit: Everything In Its Place
2nd Grade Math »
Unit: Everything In Its Place
Big Idea:
Grouping by tens reinforces the understanding of place value
Standards:
Favorites
(6)
Resources
(11)
Reflections
(1)
Manipulation Central
2nd Grade Math »
Unit: More Complex Numbers and Operations
2nd Grade Math »
Unit: More Complex Numbers and Operations
Magic of Adding Tens
2nd Grade Math »
Unit: Sensible Numbers
2nd Grade Math »
Unit: Sensible Numbers
Big Idea:
Students should have mastered adding numbers within 10 in first grade. The Common Core stresses adding bundles of tens in second grade.
Standards:
Favorites
(3)
Resources
(12)
Reflections
(2)
Common Core Math
Kindergarten
First Grade
Second Grade
Third Grade
Fourth Grade
Fifth Grade
Sixth Grade
Seventh Grade
HS Number & Quantity
HS Algebra
HS Functions
HS Geometry
Kindergarten
First Grade
Second Grade
Third Grade
Fourth Grade
Fifth Grade
Sixth Grade
Seventh Grade
Eighth Grade
Ninth and Tenth Grade
Kindergarten
First grade
Second grade
Third Grade
Fourth grade
Fifth grade
Middle School
Kindergarten
First Grade
Second Grade
Third Grade
Fourth Grade
Fifth Grade
Sixth Grade
Seventh Grade
HS Number & Quantity
HS Algebra
HS Functions
HS Geometry
Kindergarten
First Grade
Second Grade
Third Grade
Fourth Grade
Fifth Grade
Sixth Grade
Seventh Grade
Eighth Grade
Ninth and Tenth Grade
Kindergarten
First grade
Second grade
Third Grade
Fourth grade
Fifth grade
Middle School
