# Addition and Subtraction Within 100

Central concept: **Addition and Subtraction Within 100**

## Connections

- Addition and Subtraction Within 100 (builds on) -> Number Facts
- Addition and Subtraction Within 100 (uses) -> Addition and Subtraction Strategies
- Addition and Subtraction Within 100 (includes) -> Compose a Sum
- Addition and Subtraction Within 100 (represents) -> Represent Quantities
- Addition and Subtraction Strategies (includes) -> Making Multiples of Ten
- Addition and Subtraction Strategies (includes) -> Using Doubles
- Compose a Sum (shows) -> Order Does Not Matter
- Compose a Sum (applies to) -> Visualize 100
- Addition and Subtraction Within 100 (checks) -> Verify Using Inverse
- Addition and Subtraction Within 100 (solves) -> Find Missing Quantity
- Represent Quantities (leads to) -> Solve Real Problems
- Number Facts (facilitates) -> Addition and Subtraction Strategies

## Notes

- **Addition and Subtraction Within 100**: Grade 2 students investigate how to add and subtract numbers up to 100. [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- **Number Facts**: Addition facts with addends to 10 and related subtraction facts. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- **Addition and Subtraction Strategies**: Strategies for two-digit numbers include making tens and using doubles. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850), [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- **Making Multiples of Ten**: A key strategy for adding and subtracting two-digit numbers. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850), [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- **Using Doubles**: A strategy where you add a number to itself or use near-doubles. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850), [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- **Compose a Sum**: A sum can be made in multiple ways, including with more than two 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 Does Not Matter**: The order in which more than two numbers are added does not change the sum. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846), [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)
- **Represent Quantities**: Addition and subtraction show the sum or difference of countable items or lengths. [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851), [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)
- **Verify Using Inverse**: Check a sum or difference by using the opposite operation. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- **Find Missing Quantity**: Determine a missing number in an addition or subtraction sentence. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- **Visualize 100**: See 100 as made up of tens in different ways. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848), [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)
- **Solve Real Problems**: Use addition and subtraction to solve problems with objects or lengths. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)

![Addition and Subtraction Within 100](https://goa-cc-uat-aili-app-001.azurewebsites.net/api/generate/79f6bda9-3aad-4ab3-bd2e-0e5c9cb136d8/asset/933)

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*AILI word map · language en · model claude-haiku-4-5-20251001 · generated 2026-09-17 · id 79f6bda9-3aad-4ab3-bd2e-0e5c9cb136d8*

### 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)