# Addition and Subtraction Within 100

This sheet helps you practise addition and subtraction within 100([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)). You will use number facts, strategies, and checking skills from [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846).

## Exercises

**1. Solve these facts. Use doubles or making ten to help.**

a) 7 + 6 = ______

b) 9 + 8 = ______

c) 14 − 6 = ______

d) 15 − 7 = ______

**2. Add or subtract these two-digit numbers.**

a) 34 + 25 = ______

b) 58 + 17 = ______

c) 76 − 29 = ______

d) 91 − 48 = ______

**3. Show 100 as a sum of tens in three different ways. Fill in the blanks.**

a) 10 + 10 + 10 + 10 + ______ + ______ + ______ + ______ + ______ + ______ = 100

b) 20 + 20 + ______ + ______ + ______ = 100

c) 50 + ______ + ______ = 100

**4. Match each subtraction problem to its correct answer.**

| Problem | Answer |
|---|---|
| 82 − 35 | A) 27 |
| 63 − 36 | B) 19 |
| 71 − 18 | C) 47 |
| 90 − 71 | D) 53 |

Write your matches here:

82 − 35 = ______

63 − 36 = ______

71 − 18 = ______

90 − 71 = ______

**5. Find the missing number. Then check your answer using the inverse operation ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)).**

a) 23 + ______ = 40 Check: 40 − 23 = ______

b) ______ − 19 = 26 Check: 26 + 19 = ______

c) 55 + ______ = 100 Check: 100 − 55 = ______

**6. Solve the word problem. Show your work.**

Priya has 48 stickers. Her friend gives her 27 more stickers.

Then Priya gives 15 stickers to her sister.

How many stickers does Priya have now?

Work space:

_______________________________________

_______________________________________

Answer: ______ stickers

## Answer key

1. a) 13 b) 17 c) 8 d) 8
2. a) 59 b) 75 c) 47 d) 43
3. a) 10+10+10+10+10+10+10+10+10+10 = 100 (ten 10s) b) 20+20+20+20+20 = 100 (five 20s) c) 50+30+20 = 100 (accept other combinations of tens)
4. 82 − 35 = C) 47; 63 − 36 = A) 27; 71 − 18 = D) 53; 90 − 71 = B) 19
5. a) 17, check 17 b) 45, check 45 c) 45, check 45
6. 48 + 27 = 75, then 75 − 15 = 60. Answer: 60 stickers

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*AILI homework sheet · language en · model claude-sonnet-5 · generated 2026-09-17 · id f6d6972e-3ce6-4cb5-832b-e5de8399d391*

### Sources

- node:n1: Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29820)
- node:n2: How can addition and subtraction be interpreted? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29843)
- node:n3: Students investigate addition and subtraction within 100. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)
- node:n4: Details (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846)