# Addition and Subtraction Within 100 This sheet gives you practice adding and subtracting numbers up to 100, just like we investigate in class ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29844)). You will use number facts, addition strategies, and word problems to find sums and differences ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)). ## Exercises **1. Quick facts.** Fill in each answer. These facts can help with bigger problems ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29850)). 7 + 6 = ______ 9 + 8 = ______ 6 + 6 = ______ 14 − 6 = ______ 17 − 9 = ______ 12 − 6 = ______ **2. Two-digit addition and subtraction.** Solve each problem. Show your regrouping if you need to ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)). 34 + 28 = ______ 56 − 19 = ______ 47 + 45 = ______ 82 − 37 = ______ **3. Missing numbers.** Find the number that makes each equation true ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)). 30 + ______ = 70 ______ − 15 = 40 25 + ______ = 100 90 − ______ = 55 **4. Three addends.** Add these three numbers together. Try grouping two numbers first to make a ten ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29846), [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29848)). 8 + 5 + 2 = ______ 10 + 30 + 20 = ______ 7 + 3 + 9 = ______ **5. Check your work.** Solve the subtraction problem. Then use addition to check that your answer is correct ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29852)). 63 − 28 = ______ Check: ______ + 28 = 63 (Is this true? Circle Yes or No) Yes No **6. Word problem.** Read the problem. Write a number sentence and solve it ([Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29851)). Maya has 45 stickers. Her friend gives her 38 more stickers. How many stickers does Maya have now? Number sentence: ______________________ Answer: ______ stickers A farmer has 72 apples. He sells 26 apples at the market. How many apples does he have left? Number sentence: ______________________ Answer: ______ apples ## Answer key 1. 13, 17, 12, 8, 8, 6 2. 62, 37, 92, 45 3. 40, 55, 75, 35 4. 15, 60, 19 5. 35; check: 35 + 28 = 63, Yes 6. Maya: 45 + 38 = 83 stickers; Farmer: 72 − 26 = 46 apples --- *AILI homework sheet · language en · model claude-sonnet-5 · generated 2026-09-17 · id 6155d665-503f-49b3-b6e7-bb6d4dea603f* ### 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) - resource:r1: Resources › type#activity, type#classroomactivity › MAT2, MAT3, MAT4, MAT5 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/zcsdujXlaUa2uuq1-kBv0Q)