# Addition and Subtraction Quiz

*Time: 15 min. 6 questions.*

## Instructions

Answer each question the best you can. You can draw pictures, use a number line, or use blocks to help you think. Show your work if you can!

## Questions

1. Sione has 47 stickers. He gets 30 more stickers. How many stickers does he have now? ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

2. True or false: 4 + 5 + 6 gives the same sum no matter which two numbers you add first. ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

3. What is 58 − 20?

A) 78
B) 38
C) 48
D) 28 ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

4. Priya says she can make 100 using tens. Write one way to make 100 using only tens (for example, 10 + 10 +...). ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848))

5. Which pair of number facts shows addition and subtraction that "undo" each other?

A) 6 + 3 = 9 and 9 − 3 = 6
B) 6 + 3 = 9 and 9 − 6 = 15
C) 6 + 3 = 10 and 10 − 4 = 6
D) 6 + 3 = 9 and 8 − 3 = 5 ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

6. Maya has some crayons. She gives away 15 crayons and has 35 left. How many crayons did Maya start with? ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

## Curriculum coverage

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

## Answer key

1. **77 stickers.** Adding 47 + 30 gives a sum within 100, which students find using two-digit addition strategies ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

2. **True.** The order in which more than two numbers are added does not change the sum, because of the associative property ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).

3. **B) 38.** Subtracting 20 from 58 gives 38, found by subtracting tens ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

4. **Sample answer: 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 100.** One hundred can be made as a composition of multiples of ten in many ways ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)).

5. **A) 6 + 3 = 9 and 9 − 3 = 6.** Subtraction can verify an addition fact through the inverse operation ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

6. **50 crayons.** Since 35 + 15 = 50, Maya started with 50 crayons, found by using addition to check a subtraction problem ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

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*AILI quiz · language en · model claude-sonnet-5 · generated 2026-09-17 · id eb1c04ce-73fd-407b-ada1-f1a40eb11e9f*

### 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)
- node:n16: 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)