2.NBT.A.1a
100 can be thought of as a bundle of ten tens â called a âhundred.â
5 Lessons
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Each Number Has a Place: Tens and Ones2nd 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.
Change From $1.002nd Grade Math» Unit:Money
2nd Grade Math
» Unit:
Money
Big Idea:Breaking apart numbers is one way to approach making change and relates to an understanding of how numbers can be manipulated.
Moving Along In Tens2nd 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
Manipulation Central2nd Grade Math» Unit:More Complex Numbers and Operations
2nd Grade Math
» Unit:
More Complex Numbers and Operations
Big Idea:Not everyone solves a problem in the same way. Reinforcing that different strategies can be used effectively is the goal of this lesson.
Magic of Adding Tens2nd 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.
2.NBT.A.1a
100 can be thought of as a bundle of ten tens â called a âhundred.â
2.NBT.A.1b
The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).