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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.

Each Number Has a Place: Tens and Ones

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 $1.00

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 Tens

2nd Grade Math

» Unit:

Everything In Its Place

Big Idea:Grouping by tens reinforces the understanding of place value

Manipulation Central

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 Tens

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 — called a “hundred.”

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).