# Addition and Subtraction Within 100 (Grade 2)

Central concept: **Addition & Subtraction to 100**

## Connections

- Addition & Subtraction to 100 (explores) -> Composing 100
- Composing 100 (shows) -> Sums Made Many Ways
- Composing 100 (uses) -> Order Doesn't Change Sum
- Addition & Subtraction to 100 (relies on) -> Number Facts
- Number Facts (supports) -> Strategies
- Strategies (includes) -> Make Tens
- Strategies (includes) -> Use Doubles
- Addition & Subtraction to 100 (practices) -> Add to 100
- Addition & Subtraction to 100 (practices) -> Subtract from 100
- Add to 100 (verified by) -> Check with Inverse
- Subtract from 100 (verified by) -> Check with Inverse
- Addition & Subtraction to 100 (finds) -> Missing Number
- Addition & Subtraction to 100 (means) -> Represents Quantities
- Represents Quantities (used for) -> Solve Problems

## Notes

- **Addition & Subtraction to 100**: Grade 2 students investigate addition and subtraction within 100. [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- **Composing 100**: 100 can be seen as a mix of groups of 10. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)
- **Sums Made Many Ways**: One sum can be made in more than one way, even with extra addends. [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847), [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)
- **Order Doesn't Change Sum**: Adding numbers in a different order still gives the same sum. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)
- **Number Facts**: Knowing facts to 10 helps with bigger addition and subtraction. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- **Strategies**: Ways to add and subtract two-digit numbers. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- **Make Tens**: Group numbers into tens to add or subtract easier. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- **Use Doubles**: Doubles facts, like 5+5, help solve harder problems. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- **Add to 100**: Add numbers so the total reaches up to 100. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- **Subtract from 100**: Subtract numbers starting from up to 100. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- **Check with Inverse**: Use the opposite operation to check a sum or difference. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- **Missing Number**: Find a missing part in an addition or subtraction problem. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- **Represents Quantities**: Addition and subtraction show totals or differences of things we count or measure. [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)
- **Solve Problems**: Use addition and subtraction with objects or lengths to solve real problems. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852), [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)

![Addition and Subtraction Within 100 (Grade 2)](https://goa-cc-uat-aili-app-001.azurewebsites.net/api/generate/543d5a80-5693-40e3-9cec-6a47e1ef1bc5/asset/441)

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*AILI word map · language en · model claude-sonnet-5 · generated 2026-09-17 · id 543d5a80-5693-40e3-9cec-6a47e1ef1bc5*

### Sources

- node:n1: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29843)
- node:n2: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- node:n3: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)
- node:n4: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)
- node:n5: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847)
- node:n6: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- node:n7: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- node:n8: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)
- node:n9: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- node:n10: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- node:n11: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)
- node:n12: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- node:n13: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847)
- node:n14: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)
- node:n15: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)