# Addition and Subtraction Within 100

*Time: 15 min. 6 questions.*

## Instructions

Answer each question on your own. You can use a hundreds chart or draw pictures to help. Show your thinking where you can.

## Questions

1. What is 34 + 10? ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850))

A) 44
B) 35
C) 24
D) 43

2. True or false: 20 + 30 + 5 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. Maria has 47 stickers. She gives some away and now has 30 stickers. How many stickers did Maria give away? ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

4. Which pair of numbers adds up to 100? ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848))

A) 40 and 50
B) 60 and 30
C) 70 and 30
D) 80 and 10

5. Write two different ways to make a sum of 15, using three addends each time. ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848))

6. A ribbon is 62 centimetres long. Another ribbon is 25 centimetres long. What is the total length of both ribbons? ([Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851))

## Curriculum coverage

| Question | Outcome alias |
|---|---|
| 1 | [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850) |
| 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/29848) |
| 6 | [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851) |

## Answer key

1. **A) 44.** Adding 10 to a two-digit number means the tens digit goes up by one, so 34 + 10 = 44.

2. **True.** The associative property says the order of adding does not change the sum, so grouping 20 + 30 first or 30 + 5 first still gives the same total.

3. **17 stickers.** Since 47 − 30 = 17, Maria gave away 17 stickers.

4. **C) 70 and 30.** Only 70 + 30 equals 100, since 40 + 50 = 90, 60 + 30 = 90, and 80 + 10 = 90.

5. **Example: 5 + 5 + 5 = 15 and 10 + 3 + 2 = 15.** Any two combinations of three numbers that total 15 are correct, since a sum can be composed in multiple ways.

6. **87 centimetres.** Adding the two lengths, 62 + 25 = 87, gives the total length of both ribbons.

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*AILI quiz · language en · model claude-sonnet-5 · generated 2026-09-17 · id df11196f-25ea-45d1-a81e-38fe9df0b981*

### 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? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29847)
- 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? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- 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#assessment, type#lessonplan › MAT2 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/N0Zgv8CvBkS45pSOaAiBzA)