# Grade 2: Mathematics

A course roadmap (maths). Language: en. By @si. Licence: CC BY-SA 4.0. 0 of 6 concepts ready. In the app: https://ai.page/roadmap/id-grade-2

Part of: [Idaho: Mathematics](https://ai.page/roadmap/id.md)

Goal: Idaho academic standards: Mathematics, Grade 2

## 1. Geometry · Partition circles and rectangles into two, three, or four equal shares. Understand for these examples that decomposing into more equal shares creates smaller shares.

- [Halves & Quarters of Shapes](https://ai.page/c/halves-and-quarters-of-shapes/index.md): Partition circles and rectangles into two and four equal shares and describe them using the words halves, fourths, and quarters
- [Decomposing a shape into more equal shares](https://ai.page/c/decomposing-a-shape-into-more-equal-shares/index.md): Understand that decomposing a shape into more equal shares creates smaller shares
- [Splitting shapes into equal parts (age 7+)](https://ai.page/c/splitting-shapes-into-equal-parts-age-7/index.md): Partition circles and rectangles into two, three, or four equal shares; describe shares as halves, thirds, and fourths; recognise that equal shares of identical wholes need not have the same shape

## 2. Number and Operations in Base Ten · Add and subtract whole numbers within 1,000, by using physical, visual, and symbolic representations, with an emphasis on place value, properties of operations, and

- [Addition and subtraction within 1000](https://ai.page/c/addition-and-subtraction-within-1000/index.md): Add and subtract within 1000 using concrete models, drawings, and strategies based on place value; understand composing and decomposing tens and hundreds

## 3. Number and Operations in Base Ten · Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. Understand:

- [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

## Health: 0 of 100

Of its 6 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):

- Halves & Quarters of Shapes has no explanation yet
- Decomposing a shape into more equal shares has no explanation yet
- Splitting shapes into equal parts (age 7+) has no explanation yet
- Addition and subtraction within 1000 comes before The three digits of a three-digit number, which it needs
- Addition and subtraction within 1000 has no explanation yet
- A Hundred Is Ten Tens has no explanation yet
- The three digits of a three-digit number has no explanation yet

Credit: The structure of Idaho academic standards: Mathematics (https://www.sde.idaho.gov/topics/admin-rules/files/negotiated-rulemaking/Idaho-K-12-State-Standards-for-Mathematics.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.