# Addition and Subtraction Within 100

*Time: 15 min. 6 questions.*

## Instructions

Answer all six questions. Use the space provided to show your thinking. You may draw pictures, write numbers, or use words to explain your answer. Do your best work.

## Questions

1. What is 23 + 15?
 A) 37
 B) 38
 C) 39
 D) 40
 ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

2. Maya has 42 stickers. She gives 18 stickers to her friend. How many stickers does Maya have left? Show your work or explain how you found your answer.
 ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

3. True or false: 5 + 7 + 3 = 3 + 7 + 5
 ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844))

4. Sam has two bags of blocks. One bag has 30 blocks. The other bag has 20 blocks. How many blocks does Sam have in total?
 ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

5. Which number sentence is correct?
 A) 50 − 12 = 39
 B) 50 − 12 = 38
 C) 50 − 12 = 37
 D) 50 − 12 = 36
 ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

6. There are 25 children in the lunch line. 17 more children join the line. How many children are in the line now? Write the number.
 ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

## Curriculum Coverage

| Question | Learning Outcome |
|---|---|
| 1 | [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) |
| 2 | [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) |
| 3 | [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844) |
| 4 | [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) |
| 5 | [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) |
| 6 | [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) |

## Answer Key

1. B) 38. Adding 23 and 15 by making a ten gives 23 + 15 = 38.

2. 24 stickers. Subtracting 18 from 42 (or counting up from 18 to 42) gives 24.

3. True. The order of the addends does not change the sum; both equal 15.

4. 50 blocks. Adding 30 and 20 (two multiples of ten) gives 50.

5. B) 50 − 12 = 38. Subtracting 12 from 50 leaves 38.

6. 42. Adding 25 and 17 gives 42 children in the line.

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*AILI quiz · language en · model claude-haiku-4-5-20251001 · generated 2026-09-17 · id cf0d7b71-7712-4a36-974a-bbcce29338c6*

### 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/29820)
- node:n2: How can addition and subtraction be interpreted? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29843)
- node:n3: Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- node:n4: Details (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)