# Addition and Subtraction Within 100 Quiz

*Time: 20 min. 6 questions.*

## Instructions

Read each question carefully. Use pencil, paper, or base-10 blocks if they help you. Show your thinking where you can. Do your best on every question.

## Questions

1. What is 47 + 30?
A) 57
B) 67
C) 77
D) 87
([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

2. We can make 100 out of tens. Write two different ways to make 100 using tens. One example: 5 tens + 5 tens. ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848))

3. True or false: If you add 3 + 5 + 2, you get the same sum no matter what order you add the numbers in. ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

4. Subtract: 82 − 45 = ___ ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

5. Mia adds 26 + 14 and gets 40. She wants to check her answer using subtraction. Which subtraction fact proves she is correct?
A) 40 − 14 = 26
B) 40 + 14 = 54
C) 26 − 40 = 14
D) 14 − 26 = 12
([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

6. Sam has 38 stickers. He gives away 15 stickers. Write an equation and find how many stickers Sam has left. ([Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851))

## Curriculum coverage

| Question | Outcome alias |
|---|---|
| 1 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) |
| 2 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848) |
| 3 | [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) |
| 4 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) |
| 5 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) |
| 6 | [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851) |

## Answer key

1. B) 77. Adding 47 + 30 makes a new ten group, giving 77 ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

2. Any two correct combinations work, such as 10 tens = 100, or 4 tens + 6 tens = 100. This shows 100 can be built from multiples of ten in more than one way ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)).

3. True. Changing the order of the numbers being added does not change the sum, because of the associative property ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).

4. 37. Taking 45 away from 82 leaves 37 ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

5. A) 40 − 14 = 26. Subtracting one addend from the sum should give back the other addend, which checks the original addition ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

6. 38 − 15 = 23. Sam has 23 stickers left, because subtraction finds the difference between a starting quantity and the amount given away ([Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)).

---
*AILI quiz · language en · model claude-sonnet-5 · generated 2026-09-17 · id f824c810-96ac-4d2a-94e3-b6a339adf94d*

### Sources

- node:n1: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29843)
- node:n2: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- node:n3: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)
- node:n4: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)
- node:n5: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847)
- node:n6: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- node:n7: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- node:n8: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)
- node:n9: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)
- node:n10: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)
- node:n11: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)
- node:n12: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- node:n13: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847)
- node:n14: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)
- node:n15: Mathematics › Mathematics (K–6) › Grade 2 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can addition and subtraction be interpreted? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)
- resource:r1: Resources › type#activity, type#classroomactivity › MAT2, MAT3, MAT4, MAT5 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/zcsdujXlaUa2uuq1-kBv0Q)