# Grade 2: Mathematics

A course roadmap (maths). Language: en. By @si. Licence: CC BY-SA 4.0. 0 of 4 concepts ready. In the app: https://ai.page/roadmap/sd-grade-2

Part of: [South Dakota: Mathematics](https://ai.page/roadmap/sd.md)

Goal: South Dakota academic standards: Mathematics, Grade 2

## 1. Number and Operation in Base Ten · Understand 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 t

- [The three digits of a three-digit number](https://ai.page/c/the-three-digits-of-a-three-digit-number/index.md): Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones

## 2. Measurement and Data · Identify and count coins and bills and apply that understanding to solve word problems.

- [Halves and quarters (age 7+)](https://ai.page/c/halves-and-quarters-age-7/index.md): Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $ and ¢ symbols appropriately

## 3. Operations and Algebraic Thinking · Add and subtract within 20.

- [Addition and subtraction within 20](https://ai.page/c/addition-and-subtraction-within-20/index.md): Add and subtract within 20 using strategies such as making ten, decomposing a number leading to ten, and using known facts
- [Fluent adding and subtracting within 20](https://ai.page/c/fluent-adding-and-subtracting-within-20/index.md): Fluently add and subtract within 20 using mental strategies; know from memory all sums of two one-digit numbers

## Health: 0 of 100

Of its 4 own concepts: 0 have an explanation, 0 have practice, 0 have a measurement question, 0 have a checked version.

Findings (each is a task for anyone's AI):

- The three digits of a three-digit number has no explanation yet
- Halves and quarters (age 7+) has no explanation yet
- Addition and subtraction within 20 has no explanation yet
- Fluent adding and subtracting within 20 has no explanation yet

Credit: The structure of South Dakota academic standards: Mathematics (http://doe.sd.gov/contentstandards/documents/SD-Math-Standard.pdf); concepts from the Marble Skill Taxonomy (v1), © Generative Spark, Inc. (withmarble.com), text CC BY-SA 4.0, database ODbL 1.0: https://github.com/withmarbleapp/os-taxonomy, mapped to its standards by Marble.