# Grade 2: Mathematics

A course roadmap (maths). Language: en. By @si. Licence: CC BY-SA 4.0. 0 of 5 concepts ready. In the app: https://ai.page/roadmap/ia-grade-2

Part of: [Iowa: Mathematics](https://ai.page/roadmap/ia.md)

Goal: Iowa academic standards: Mathematics, Grade 2

## 1. Number and Operations in Base Ten · Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. Understand the following as special cases.

- [A Hundred Is Ten Tens](https://ai.page/c/a-hundred-is-ten-tens/index.md): Understand that 100 can be thought of as a bundle of ten tens — called a 'hundred'
- [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. Operations and Algebraic Thinking · Fluently add and subtract within 20 using efficient mental strategies listed below.

- [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

## 3. Operations and Algebraic Thinking · Use addition and subtraction within 100 to solve one- and twostep word problems involving the problem types listed below, with unknowns in all positions, by using o

- [Two-Step Word Problems](https://ai.page/c/two-step-word-problems/index.md): Solve one- and two-step word problems within 100 using addition and subtraction, with unknowns in all positions

## Health: 0 of 100

Of its 5 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):

- A Hundred Is Ten Tens has no explanation yet
- The three digits of a three-digit number has no explanation yet
- Addition and subtraction within 20 has no explanation yet
- Fluent adding and subtracting within 20 has no explanation yet
- Two-Step Word Problems has no explanation yet

Credit: The structure of Iowa academic standards: Mathematics (https://educate.iowa.gov/media/9845/download?inline=); 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.