# Addition and Subtraction Within 100

*Time: 15 min. 6 questions.*

## Instructions

Answer each question on your own. You can use counters, a number line, or draw pictures to help. Read each question twice before you answer.

## Questions

1. Which two numbers add up to 70?
A) 30 + 40
B) 20 + 40
C) 50 + 10
D) 60 + 20
([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

2. Show two different ways to make 100, using tens. Write both ways as addition sentences. ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

3. True or false: In 3 + 4 + 6, you get the same sum no matter which two numbers you add first. ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

4. Sina has 46 stickers. She gets 27 more stickers. How many stickers does she have now? ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844))

5. Which subtraction sentence checks that 45 + 20 = 65?
A) 65 − 20 = 45
B) 45 − 20 = 25
C) 65 + 20 = 85
D) 20 − 45 = 25
([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

6. Find the missing number: 38 + ___ = 60. ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

## Curriculum coverage

| Question | Outcome alias |
|---|---|
| 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 | [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) |
| 4 | [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844) |
| 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. A) 30 + 40. Thirty plus forty makes seventy, matching the composition-of-100-and-related-sums skill ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).
2. Any two correct pairs, such as 40 + 60 = 100 and 70 + 30 = 100. This shows 100 can be composed as a sum of tens in more than one way ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).
3. True. Changing the order of the addends does not change the total, which is the associative property ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).
4. 73 stickers. Adding 46 and 27 gives a sum within 100, solving a problem about countable quantities ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)).
5. A) 65 − 20 = 45. Subtracting one addend from the sum should return the other addend, checking the answer with the inverse operation ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).
6. 22. Since 38 + 22 = 60, 22 is the missing addend found within 100 ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).

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*AILI quiz · language en · model claude-sonnet-5 · generated 2026-09-17 · id c09acb30-2268-49b9-b785-cb62f94434a0*

### 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)