# Addition and Subtraction within 100

*Time: 15 min. 6 questions.*

## Instructions

Answer each question. You may draw a picture, use objects, or write numbers to show your thinking. Do your best on every question.

## Questions

1. What is 24 + 13?
A) 35
B) 36
C) 37
D) 38
([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

2. Maya has 42 stickers. She gives away 15 stickers. How many stickers does Maya have left? Show your work or explain how you know.
([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

3. True or false: 5 + 6 + 4 = 4 + 5 + 6
([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844))

4. Fill in the missing number: 30 + __ = 50
([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

5. Which strategy could help you add 18 + 12?
A) Count all the way from 1
B) Make a group of 10 and add the rest
C) Use a subtraction fact
D) Count backwards
([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

6. A rope is 35 centimetres long. Another rope is 28 centimetres long. What is the difference in length between the two ropes?
([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. **C) 37.** Adding 24 + 13 by making tens (20 + 10 = 30, then 4 + 3 = 7, then 30 + 7 = 37) shows the strategy of composing multiples of ten.

2. **27 stickers.** Subtracting 15 from 42 (either by counting up from 15 to 42, or by taking away 15 from 42) solves a subtraction problem involving a measurable or countable quantity.

3. **True.** The order in which numbers are added does not change the sum, which demonstrates the associative property of addition.

4. **20.** Adding 30 + 20 = 50 shows understanding of composing 100 as multiples of 10, and finding a missing addend uses inverse operations.

5. **B) Make a group of 10 and add the rest.** This strategy uses making multiples of ten, which is a key strategy for adding two-digit numbers.

6. **7 centimetres.** Subtracting 28 from 35 (or finding the difference between 35 and 28) solves a problem using subtraction of measurable lengths.

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*AILI quiz · language en · model claude-haiku-4-5-20251001 · generated 2026-09-17 · id 5e815324-80e7-4e00-96d7-bf582156714e*

### 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)