1. Complete the following addition exercises. 3 + 7 = 10 2 + 9 = 11 4 + 6 = 10 5 + 9 = 14 12 + 5 = 17 6 + 3 = 9 8 + 3 = 11 10 + 0 = 10 9 + 8 = 17 1 + 9 = 10 7 + 6 = 13 9 + 3 = 12 6 + 8 = 14 0 + 3 = 3 3 + 6 = 9 7 + 1 = 8 4 + 2 = 6 4 + 7 = 11 11 + 3 = 14 7 + 7 = 14 9 + 7 = 16 12 + 9 = 21 2. A chain 5 links long is joined to a chain 7 links long. How many links long is the resulting chain? 3. A jogger runs 4 miles on Monday, 5 miles on Tuesday, 3 miles on Wednesday, and 5 miles on Thursday. He doesn’t run on Friday. How many miles did he run in all? 4. Katrina owns a 9-acre farm. Last month, she bought her neighbor’s adjoining 8-acre farm. How large is Katrina’s farm now? 5. Find the sum of each pair of whole numbers. a. 436 and 1,306 b. 652 and 798 c. 3,549 and 64,231 d. 897 and 6,492,069 6. Find the sum of each group of numbers. You may add the numbers in any order. Then, check your work by adding the numbers again in a different order. a. 110, 83, and 328 b. 92, 37, 14, and 66 c. 432, 11, 157, and 30 7. In March, volunteers for a charity walkathon in Toronto raised $89,351. Volunteers in Montreal raised $102,459. Volunteers in Edmonton raised $78,505. a. Round each amount to the nearest thousand dollars. b. Add the rounded amounts to estimate the total amount of money raised. c. Use the estimate to choose the exact total from among the following. (1) $250,615 (2) $350,615 (3) $270,315 (4) $170,015 8. Solve each of the following addition problems. a. 56 + 378 + 299 = b. 32,465 + 16,002 + 5,432 = c. 231 + 43 + 309 = d. 3,256 + 14,578 + 20,432 = e. 541 + 1,327 + 1,567 = f. 117 + 306 = g. 17 + 288 + 432 = h. 24 + 11 + 9 = i. 164 + 46 + 327 = j. 246 + 718 = 9. Three bricklayers from the Emerald Construction Company are working on the new addition to an office building. The first bricklayer laid 8,792 bricks; the second laid 9,491 bricks; and the third laid 9,629 bricks this week. How many bricks did they lay in all? 10. In 2013, the population of Detroit was 743,204. The population of the city of Detroit in the year 1970 was 688,701 greater than in 2013. What was the total population of Detroit in 1970?