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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

Â» 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.

Odd or Even

2nd Grade Math

Â» Unit:

Each Number Has a Place

Big Idea:The big idea of this lesson is for students to be able to determine odd and even numbers and why it would be important to understand odd and even groups.

Finding the Right Place!

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:Students use numbers, base-ten models, and real-word pictures to examine ways to place numbers in their correct place.

What is a Digit

2nd Grade Math

Â» Unit:

Sensible Numbers

Big Idea:Students extend their understanding of the place value system, in base-ten notation, recognizing that the digits in each place represent amounts of hundreds, tens or ones.

Identifying Tens and Ones

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:Students will be given set amount of money to add, and identify how many tens and ones.

Moving Along In Tens

2nd Grade Math

Â» Unit:

Everything In Its Place

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

How Big Is One Thousand

2nd Grade Math

Â» Unit:

More Complex Numbers and Operations

Big Idea:Students can get a picture of how big 1,000 is as they build and compare 3-digit numbers.

Put It Together and Take It Apart

2nd Grade Math

Â» Unit:

Numbers Have Patterns

Big Idea:Students increase their understanding of place value by manipulating larger numbers.

The Purpose of Zero

2nd Grade Math

Â» Unit:

Money

Big Idea:Zero makes a difference, depending on where it is. It may be worth nothing, but it has a special place in numbers.

Where Can I Find It

2nd Grade Math

Â» Unit:

Sensible Numbers

Big Idea:The Common Core standard is for students to add and subtract numbers within 100 fluently using models. They must understand the place value to build the models.

Students as Teachers Part II

2nd Grade Math

Â» Unit:

More Complex Numbers and Operations

Big Idea:Students are given the chance to teach about how they solve math problems.

Counting with Yen

2nd Grade Math

Â» Unit:

Place Value

Big Idea:Japanese yen work on a Base 10 system. Students can review taking larger numbers apart while learning more about the Japanese money system.

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).