# Addition and Subtraction Within 100

*Time: 20 min. 8 questions.*

## Instructions

Answer each question on your own. You can use counters, a hundred chart, or draw pictures to help you. Show your thinking for the short-answer questions.

## Questions

1. What is 7 + 6?

A) 12
B) 13
C) 14
D) 11
([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

2. Maya adds 34 + 20 by thinking of 20 as two tens. Write the two steps she uses to find the answer. ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850))

3. True or False: If you add 3 + 4 + 6, you get the same sum no matter which two numbers you add first. ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846))

4. What is 58 + 25? ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

5. A number sentence says: 47 + ___ = 90. What number goes in the blank?

A) 33
B) 43
C) 53
D) 63
([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

6. Show two different ways to make a sum of 50 using tens, for example 30 + 20. Write both ways. ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848))

7. True or False: You can check that 62 − 15 = 47 by adding 47 + 15 to see if you get 62. ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852))

8. A ribbon is 92 centimetres long. Sam cuts off 38 centimetres. How many centimetres of ribbon are 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 | [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850) |
| 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 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848) |
| 7 | [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852) |
| 8 | [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851) |

## Answer key

1. B) 13. Seven plus six equals thirteen, an addition fact with addends to 10 ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

2. Maya can add 34 + 20 = 34 + 10 + 10, or think 3 tens plus 2 tens makes 5 tens, then add the 4 ones: 50 + 4 = 54. Making multiples of ten is a strategy for adding two-digit numbers ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)).

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

4. 83. Fifty-eight plus twenty-five equals eighty-three, a sum within 100 ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

5. C) 53. Forty-seven plus fifty-three equals ninety, so 53 is the missing quantity ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

6. Any two correct pairs of tens or mixed addends that total 50 are acceptable, for example 30 + 20 and 10 + 10 + 10 + 10 + 10. A sum can be composed in multiple ways using multiples of ten ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)).

7. True. Addition can verify a subtraction answer because addition and subtraction are inverse operations ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

8. 54 centimetres. Ninety-two minus thirty-eight equals fifty-four, a subtraction of a measurable length ([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 c03315ab-b1e7-4c11-a74c-c0011564708b*

### Sources

- node:n1: 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: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? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)
- 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/29848)
- 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/29847)
- 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/29850)
- 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/29852)
- 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/29851)
- 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/29852)
- 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/29850)
- 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/29848)
- 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? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- 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? › Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)
- 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/29846)