# 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) -> Two-digit strategies - Addition and subtraction within 100 (applies) -> Compose sums - Addition and subtraction within 100 (solves) -> Real-world problems - Two-digit strategies (includes) -> Make tens - Two-digit strategies (includes) -> Doubles - Number facts (demonstrates) -> Associative property - Compose sums (helps) -> Visualize 100 - Addition and subtraction within 100 (verified by) -> Inverse operations - Addition and subtraction within 100 (finds) -> Missing quantity - Addition and subtraction within 100 (means) -> Interpret operations - Real-world problems (may include) -> Missing quantity ## Notes - **Addition and subtraction within 100**: 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) - **Two-digit strategies**: Methods for adding and subtracting two-digit numbers. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850), [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) - **Make tens**: Create multiples of ten to solve addition and subtraction. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850), [Resource](https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/0NK9kueDjkiTuLghkTw7gA), [Resource](https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/UBR9NyaKR06rLqRstqVy0w) - **Doubles**: Use doubles to add and subtract two-digit numbers. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850), [Resource](https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/0NK9kueDjkiTuLghkTw7gA), [Resource](https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/UBR9NyaKR06rLqRstqVy0w) - **Compose sums**: A sum can be made in multiple ways, including with more than two addends. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848), [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847) - **Visualize 100**: See 100 as made up of multiples of 10 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) - **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 quantity**: Find an unknown number in an addition or subtraction problem. [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) - **Real-world problems**: Solve problems using quantities or measurable lengths. [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) - **Associative property**: The order of adding more than two numbers does not change the sum. [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) - **Interpret operations**: Addition and subtraction represent sums or differences of quantities. [Guiding question](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29843), [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851) ![Addition and Subtraction within 100](https://goa-cc-uat-aili-app-001.azurewebsites.net/api/generate/b44ee59d-2b24-4628-9c19-6e626f8f5d9f/asset/746) --- *AILI word map · language en · model claude-haiku-4-5-20251001 · generated 2026-09-17 · id b44ee59d-2b24-4628-9c19-6e626f8f5d9f* ### 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) - resource:r1: Resources › type#assessment, type#lessonplan › MAT2 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/0NK9kueDjkiTuLghkTw7gA) - resource:r2: Resources › type#assessment, type#lessonplan › MAT2 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/UBR9NyaKR06rLqRstqVy0w) - resource:r3: Resources › type#assessment, type#lessonplan › MAT2 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/N0Zgv8CvBkS45pSOaAiBzA)