# Addition and Subtraction Match-Up

Grade 2 students investigate addition and subtraction within 100 ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)). This game reviews the math words that describe how we combine, compare, and check numbers. You will match each word, like compose, double, or verify, to what it means. The order in which more than two numbers are added does not affect the sum (associative property) ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).

## How to play

Look at the word list. Look at the meaning list. Find the meaning that matches each word. Draw a line to connect each pair, or write the matching letter next to each number. Every word has exactly one correct match.

Some words in this game, like combine and compose, describe ways to put numbers together ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)). Other words, like compare, describe how we look at two quantities side by side ([Topic](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29820)). The word inverse describes opposite operations, like addition and subtraction undoing each other ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)). The word missing describes a number we need to find in a sum or difference ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)). The word verify means to check your answer using the opposite operation ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)). The word equal means two amounts are the same. The word double means adding a number to itself.

Take your time. Read each meaning carefully before you choose.

## Match the pairs

| Column A | | Column B |
|:---|:---:|:---|
| **A.** combine | ____ | **1.** twice as much |
| **B.** compare | ____ | **2.** subtraction undoes addition |
| **C.** compose | ____ | **3.** making sure your work is right |
| **D.** double | ____ | **4.** joining parts to find the whole |
| **E.** equal | ____ | **5.** an unknown quantity in a number sentence |
| **F.** inverse | ____ | **6.** having the same worth |
| **G.** missing | ____ | **7.** finding how much more or less one quantity is |
| **H.** verify | ____ | **8.** building a number from parts |

## Answer key

- **A** matches **4** (combine: joining parts to find the whole)
- **B** matches **7** (compare: finding how much more or less one quantity is)
- **C** matches **8** (compose: building a number from parts)
- **D** matches **1** (double: twice as much)
- **E** matches **6** (equal: having the same worth)
- **F** matches **2** (inverse: subtraction undoes addition)
- **G** matches **5** (missing: an unknown quantity in a number sentence)
- **H** matches **3** (verify: making sure your work is right)

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*AILI game · language en · model claude-sonnet-5 · generated 2026-09-17 · id 6a924612-8709-4804-9d35-a409f3e4ba5e*

### Sources

- node:n1: Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29733)
- node:n2: How can addition and subtraction provide perspectives of number? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29756)
- node:n3: Students examine addition and subtraction within 20. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29757)
- node:n4: Details (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29759)
- node:n5: Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29820)
- node:n6: How can addition and subtraction be interpreted? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29843)
- node:n7: Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- node:n8: Details (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)
- node:n9: Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29915)
- node:n10: How can processes be established for addition and subtraction? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29922)
- node:n11: Students apply strategies for addition and subtraction within 1000. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29923)
- node:n12: Details (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29925)