Series Math Routines with Kristin Gray: Second Grade: Addition Number Talk: Second Grade


Common core State Standards

  • Math:  Math
  • 2:  Grade 2
  • NBT:  Number & Operations in Base Ten
  • B:  Use place value understanding and properties of operations to add and subtract
  • 7: 
    Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Download Common Core State Standards (PDF 1.2 MB)

Addition Number Talk: Second Grade

Grade 2 / Math / Tch DIY
17 MIN


Enjoy your first video for free. Subscribe for unlimited access.

Have questions about subscribing? Click Here to learn more.

A number string is a series of mathematical expressions organized in a way that encourages students to build on their thinking as the string progresses.

Discussion and Supporting Materials


  • Private message to Cierra Harbin

The topic of the video was about students talking about how they solved 176+98. The students showed how they solved the problem by using many different strategies. A lesson that could be implemented in my classroom is to teach students that there are many other strategies to be learned while trying to solve the problem.  In the video that I watched I agree with how the teacher just let her students basically teach her. The students explained very well how they solved the problem while all having a different strategy. The teacher was able to show the students many other ways to solve the problem than just one way. It helps because there may be a student who struggles with a certain strategy but finds a new easier way to solve the problem. Even though they kept getting the right answer this lesson was a good way to show the students different ways to solve one problem.

Recommended (0)
  • Private message to Sandra Dominguez

 Very interesting video. I love number talks. It was great to see how well the students were able to express and justifiy their answer. I liked that you had them turn and talk to different people and made everyone feel validated. 

Recommended (0)
  • Private message to Brittany Lee

I really enjoyed this video. It was amazing to see how well the students were able to express their thinking to justify their answer. This is one concept that I would like to focus on by allowing students to express their answers not by just drawing a picture or problem to show their work, but also by using their words. In my classroom, we do complete Glue and Do's which requires students to explain their work, but the students in this video do it in further depth. I will continue to encourage this method in my classroom across all subjects with my students. Wonderful number talk.

Recommended (1)
  • Private message to Caroline Graham

I loved this video! The amount of strategies these second graders came up with is amazing! I like how they all came up with different strategies that worked best for them. It’s amazing how they were able to do this mentally. During this video, it was definitely student-led and the students were doing the work. The teacher was more of the facilitator. You can definitely tell that this is a routine in this classroom based on how the students were sharing their strategies and how they were commenting on each other’s strategies and even revoicing what someone else had done to solve it. One student even said “my strategy was similar to hers.” I also liked how they called the benchmark number of 100 (getting to 100 from 98) a tens number. Each time I do a number talk, my students surprise me with their strategies. I am still working on implementing this into a weekly routine, but am excited to work on it! I agree with Stephanie about showing this video to my students. I definitely think them seeing students the same age as them, will definitely help with how they share and the conversations that they can have with each other. 

Recommended (0)
  • Private message to Steph Malcom

I loved this number talk and all of the strategies the students came up with to solve 176 + 98! The number talk was so student-centered and I loved hearing them explain their thinking and why they chose their strategy. My students love sharing their strategies as well and I think I am going to show them this video to help them improve their number talk discussion. I think seeing other students their age participate in a number talk will really help them.  Excited to allow them to view this and to continue more number talks with my kiddos! Great video!!

Recommended (0)

School Details

Shields (Richard A.) Elementary School
910 Shields Avenue
Lewes DE 19958
Population: 723

Data Provided By:



Kristin Gray
Math / Kindergarten 1 2 3 4 5 / Teacher


TCH Special
46 MIN

Webinar / Teacher Wellness / Summer Learning

TCH Special

Webinar / SEL / Leadership

TCH Special

Webinar / SEL / Professional Learning

TCH Special
45 MIN

Webinar / Professional Learning / Resources


Professional Learning


Summer Learning


Lesson Planning