## 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:

28 Lesson(s)

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#### CSI First Grade! Today your young investigators will try to find the missing addend while playing two different missing addend games.

Big Idea:

#### Students head to the Lego Factory to build orders using what they know about base ten!

#### Students get hands on, minds on experience with counting, while also constructing understanding of tens and ones.

#### Students bring together all of their understanding about counting and base ten with this summative activity!

#### Students have been learning about tens and ones. This day allows them to apply what they know to a "real life" farm crisis! The chickens have laid a bunch of eggs and students have to figure out how many the farmer is collecting!

Big Idea:

#### Students use their understanding of base 10 to make coin counting a breeze!

#### The Number Grid Challenge. Students will play a game that requires them to add or subtract ten from a number using the number grid. They will record their results using standard notation.

#### Students will continue working with games that ask them to use the counting on strategy. The lesson will end with a story problem that allows for the students to use the counting on strategy in a real world situation.

Big Idea:

#### Tens, Tens! In this lesson students will use base ten blocks to build numbers to 50.

#### 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.

#### Score this party a 10! Students will join in a 10 celebration as they choose from their favorite unit activities .

#### My students have mastered counting by tens, but we are continuing to practice the skill while also learning about the place value of tens numbers.

#### My students will be working hard on place value for this unit. I want to ensure they have a strong grasp of the terms tens, ones, digit and place value.

#### Students work to count to 100 in this rigorous counting activity. Students create a shape out of their 100 objects for a creative twist.

Big Idea: