# Addition and Subtraction Within 100

Name: ______________________ Date: ______________________

This sheet gives you practice with addition and subtraction within 100 ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)). You will use number facts, strategies for two-digit numbers, and inverse operations to check your work ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850), [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)).

## Exercises

**1. Fact Families**

Fill in the missing sums and differences.

| Addition fact | Sum | Related subtraction fact | Difference |
|---|---|---|---|
| 7 + 3 = | ______ | 10 − 3 = | ______ |
| 6 + 4 = | ______ | 10 − 4 = | ______ |
| 8 + 2 = | ______ | 10 − 2 = | ______ |
| 5 + 5 = | ______ | 10 − 5 = | ______ |

**2. Two-Digit Addition**

Find each sum. Use a strategy like making a ten or using doubles.

34 + 22 = ______

45 + 38 = ______

27 + 19 = ______

53 + 29 = ______

**3. Two-Digit Subtraction**

Find each difference.

100 − 45 = ______

78 − 29 = ______

90 − 36 = ______

64 − 18 = ______

**4. Find the Missing Number**

Write the missing number in each blank.

7 + ______ = 15

______ − 9 = 6

23 + ______ = 50

______ − 17 = 33

**5. Composing Sums**

a) Write two different ways to make 60 using two addends.

______ + ______ = 60

______ + ______ = 60

b) Add these three numbers in the order given.

10 + 20 + 30 = ______

c) Now add the same three numbers in a different order.

30 + 10 + 20 = ______

d) What do you notice about the two sums in b and c? ______________________

**6. Word Problems**

a) Sara has 48 stickers. She gets 25 more stickers. How many stickers does she have now?

______________________

b) A ribbon is 90 cm long. Mom cuts off 34 cm. How long is the ribbon now?

______________________

c) Which addition sentence checks that 73 − 25 = 48?

A) 48 + 25 = 73
B) 73 + 48 = 121
C) 25 − 48 = 73
D) 73 − 73 = 0

## Answer key

1. 7+3=10, 10−3=7; 6+4=10, 10−4=6; 8+2=10, 10−2=8; 5+5=10, 10−5=5
2. 56; 83; 46; 82
3. 55; 49; 54; 46
4. 8; 15; 27; 50
5. a) any two pairs summing to 60 (example: 20+40, 10+50); b) 60; c) 60; d) The sum is the same both times.
6. a) 73 stickers; b) 56 cm; c) A

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*AILI homework sheet · language en · model claude-sonnet-5 · generated 2026-09-17 · id acd8ba5c-5099-44f6-b07a-b3baaf82b812*

### 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)