# Addition and Subtraction Within 100

*Time: 15 min. 6 questions.*

## Instructions
Answer each question by yourself. You can draw pictures, use a number line, or use blocks to help you think. Show your work if you can.

## Questions

1. What is 34 + 10?

A) 35
B) 44
C) 40
D) 24

([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844))

2. True or false: 7 + 8 gives the same answer as 8 + 7.

([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

3. Maria has 42 stickers. She gives 15 stickers to her friend. How many stickers does Maria have left?

([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844))

4. Fill in the missing number: 26 + ___ = 30.

([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

5. Which strategy could help you add 38 + 5 by making ten first?

A) Add 2 to make 40, then add 3 more
B) Subtract 5 from 38
C) Double 38
D) Count backward from 5

([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

6. What is 100 − 45?

([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844))

## Curriculum coverage

| Question | Outcome alias |
|---|---|
| 1 | [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844) |
| 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 | [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844) |

## Answer key

1. B) 44. Adding 10 to 34 changes the tens digit, so 34 + 10 = 44 ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)).

2. True. Changing the order of the addends does not change the sum; this is the commutative property.

3. 27 stickers. Subtracting 15 from 42 gives 27, since 42 − 15 = 27 ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)).

4. 4. Since 26 + 4 = 30, the missing number is 4 ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).

5. A) Add 2 to make 40, then add 3 more. Making ten first is a strategy for adding two-digit numbers ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).

6. 55. Subtracting 45 from 100 leaves 55, since 100 − 45 = 55 ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)).

---
*AILI quiz · language en · model claude-sonnet-5 · generated 2026-09-17 · id 067b244a-f59a-4f97-a5f8-f3c00a88386f*

### 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)