# Addition and Subtraction Within 100 Central concept: **Addition and Subtraction Within 100** ## Connections - Addition and Subtraction Within 100 (uses) -> Number Facts - Addition and Subtraction Within 100 (uses) -> Two-Digit Strategies - Addition and Subtraction Within 100 (involves) -> Compose Sums - Addition and Subtraction Within 100 (applies to) -> Real-World Problems - Number Facts (builds) -> Make Tens - Two-Digit Strategies (includes) -> Make Tens - Compose Sums (shows) -> Order Doesn't Matter - Compose Sums (uses) -> Visualize 100 - Real-World Problems (measures) -> Quantity and Length - Real-World Problems (finds) -> Missing Numbers - Sums to 100 (checks with) -> Inverse Operations - Addition and Subtraction Within 100 (includes) -> Sums to 100 ## Notes - **Addition and Subtraction Within 100**: Grade 2 students investigate how addition and subtraction work with numbers up to 100. [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844) - **Number Facts**: Familiar addition and subtraction facts with addends to 10 help students solve larger problems. [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) - **Two-Digit Strategies**: Making multiples of ten and using doubles are key strategies for two-digit addition and subtraction. [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) - **Make Tens**: Breaking numbers into tens helps solve addition and subtraction problems efficiently. [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) - **Compose Sums**: A sum can be made in many different ways, including with more than two addends. [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847), [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847) - **Order Doesn't Matter**: When adding more than two numbers, the order 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) - **Real-World Problems**: Addition and subtraction represent quantities and lengths in real situations. [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) - **Inverse Operations**: Addition and subtraction are opposites; use one to check the other. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) - **Missing Numbers**: Find unknown quantities in addition and subtraction sentences within 100. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) - **Visualize 100**: See 100 as groups of 10 in different ways to understand place value. [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) - **Sums to 100**: Add numbers so the total is 100 or less; subtract from numbers up to 100. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) - **Quantity and Length**: Use addition and subtraction to work with objects you can count or distances you can measure. [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/d17e2b23-4a62-4e1d-83d0-a2127d0fc862/asset/438) --- *AILI word map · language en · model claude-haiku-4-5-20251001 · generated 2026-09-17 · id d17e2b23-4a62-4e1d-83d0-a2127d0fc862* ### 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)