# Addition and Subtraction Within 100 Central concept: **Addition & Subtraction to 100** ## Connections - Addition & Subtraction to 100 (explores) -> Composing 100 - Composing 100 (uses) -> Multiples of Ten - Composing 100 (shows) -> Many Ways to Sum - Addition & Subtraction to 100 (follows) -> Associative Property - Addition & Subtraction to 100 (relies on) -> Number Facts - Number Facts (builds) -> Two-Digit Strategies - Addition & Subtraction to 100 (uses to check) -> Inverse Operations - Addition & Subtraction to 100 (finds) -> Missing Number - Addition & Subtraction to 100 (applies to) -> Problem Solving - Problem Solving (involves) -> Quantities & Lengths - Problem Solving (requires) -> Sums & Differences to 100 - Two-Digit Strategies (helps solve) -> Sums & Differences to 100 ## Notes - **Addition & Subtraction to 100**: 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 multiples of 10 put together in different ways. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848) - **Multiples of Ten**: Building blocks used to visualize 100. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848) - **Many Ways to Sum**: A sum can be made in more than one way, even 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) - **Associative Property**: Changing the order you add numbers does not change the total. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) - **Number Facts**: Knowing facts to 10 helps with adding and subtracting bigger numbers. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850) - **Two-Digit Strategies**: Includes making multiples of ten and using doubles. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850) - **Inverse Operations**: Use addition to check subtraction, and subtraction to check addition. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) - **Missing Number**: Find an unknown part in a sum or difference within 100. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) - **Problem Solving**: Solve problems about countable things or lengths using addition and subtraction. [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851), [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) - **Quantities & Lengths**: Addition and subtraction can show a sum or difference of objects or measured lengths. [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851) - **Sums & Differences to 100**: Add up to a sum of 100 and subtract with a minuend up to 100. [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/5c2eaba8-5a7e-4dad-ac23-d11c662d96ad/asset/935) --- *AILI word map · language en · model claude-sonnet-5 · generated 2026-09-17 · id 5c2eaba8-5a7e-4dad-ac23-d11c662d96ad* ### 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)