![Colorful Christmas Math #17](https://data.thuvientienganh.com/images/244/christmas-math-facts-17.jpg)
Thư Viện Tiếng Anh
Thư viện tài liệu tiếng Anh miễn phí
Subject: Addition Strategies
![Colorful Christmas Math #17](https://data.thuvientienganh.com/images/244/christmas-math-facts-17.jpg)
![Colorful Christmas Math #13](https://data.thuvientienganh.com/images/244/christmas-math-facts-13.jpg)
Colorful Christmas Math #13
![Colorful Christmas Math #10](https://data.thuvientienganh.com/images/244/christmas-math-facts-10.jpg)
Colorful Christmas Math #10
![Colorful Christmas Math #9](https://data.thuvientienganh.com/images/244/christmas-math-facts-9.jpg)
Colorful Christmas Math #9
![Adding with the Hundreds Chart](https://data.thuvientienganh.com/images/244/adding-with-the-hundreds-chart.jpg)
Adding with the Hundreds Chart
![Adding 10s on the Hundreds Chart](https://data.thuvientienganh.com/images/244/adding-10s-on-the-hundreds-chart.jpg)
Adding 10s on the Hundreds Chart
![Add the 10s First! (Part Two)](https://data.thuvientienganh.com/images/244/add-the-10s-first-ii.jpg)
Add the 10s First! (Part Two)
![Add the 10s First! (Part One)](https://data.thuvientienganh.com/images/244/add-the-10s-first.jpg)
Add the 10s First! (Part One)
![Addition Within 1000 Check-in](https://data.thuvientienganh.com/images/244/addition-within-1000-check-in.jpg)
Addition Within 1000 Check-in
![By the Numbers 2](https://data.thuvientienganh.com/images/244/by-the-numbers-2.jpg)
By the Numbers 2
![Adding Three-Digit Numbers on an Open Number Line #3](https://data.thuvientienganh.com/images/244/adding-three-digit-numbers-on-an-open-number-line-3.jpg)
Adding Three-Digit Numbers on an Open Number Line #3
![Adding Three-Digit Numbers on an Open Number Line #2](https://data.thuvientienganh.com/images/244/adding-three-digit-numbers-on-an-open-number-line-2.jpg)
Adding Three-Digit Numbers on an Open Number Line #2
![Adding Three-Digit Numbers on an Open Number Line #1](https://data.thuvientienganh.com/images/244/adding-three-digit-numbers-on-an-open-number-line-1.jpg)
Adding Three-Digit Numbers on an Open Number Line #1
![Always, Sometimes, Never](https://data.thuvientienganh.com/images/244/always-sometimes-never.jpg)
Always, Sometimes, Never
![At the Toy Store: Addition and Subtraction](https://data.thuvientienganh.com/images/244/at-the-toy-store.jpg)
At the Toy Store: Addition and Subtraction
![At the Ballpark: Addition and Subtraction](https://data.thuvientienganh.com/images/244/at-the-ballpark.jpg)
At the Ballpark: Addition and Subtraction
![What’s the Answer? Addition and Subtraction](https://data.thuvientienganh.com/images/244/answer-addition-subtraction.jpg)
What’s the Answer? Addition and Subtraction
![Add Multiple Numbers](https://data.thuvientienganh.com/images/244/add-ten-multi-number-addition.jpg)