# Addition and Subtraction within 100

*Time: 15 min. 6 questions.*

## Instructions

Answer all six questions. You may use counters, number lines, or drawings to help you. Show your thinking when asked. Work through each question carefully.

## Questions

1. What is 23 + 15? ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))
 A) 37
 B) 38
 C) 39
 D) 40

2. Maya has 42 stickers. She gives 18 stickers to her friend. How many stickers does Maya have left? Show your work. ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

3. True or false: If you add 5 + 3 + 2, you get the same answer as 3 + 5 + 2. ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

4. Write a number sentence that shows 100 as 60 and 40 added together. ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848))

5. Which number sentence is correct?
 A) 34 + 20 = 54
 B) 34 + 20 = 52
 C) 34 + 20 = 56
 D) 34 + 20 = 50

6. Sam has 30 apples. He picks more apples. Now he has 47 apples. How many apples did Sam pick? ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

## Curriculum coverage

| Question | Outcome Alias | Learning Focus |
|---|---|---|
| 1 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) | Add two-digit numbers within 100 |
| 2 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) | Subtract within 100 and solve word problems |
| 3 | [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846) | Understand the associative property of addition |
| 4 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848) | Compose 100 as a sum of multiples of 10 |
| 5 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) | Add two-digit numbers and identify correct sums |
| 6 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) | Find a missing quantity in an addition problem |

## Answer key

1. B) 38. Adding 23 + 15: 20 + 10 = 30, then 3 + 5 = 8, so 30 + 8 = 38.

2. 24 stickers. Subtracting 42 − 18: count back or use 42 − 20 + 2 = 24.

3. True. The order of the addends does not change the sum; both equal 10.

4. 60 + 40 = 100. Students may also write 40 + 60 = 100.

5. A) 34 + 20 = 54. Adding 34 + 20: 30 + 20 = 50, then 50 + 4 = 54.

6. 17 apples. Finding the missing addend: 30 +? = 47, so 47 − 30 = 17.

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*AILI quiz · language en · model claude-haiku-4-5-20251001 · generated 2026-09-17 · id a864fc57-6c55-46ae-9605-53db153a6d71*

### 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)