CA-74 Chapter 3 . Addition and Subtraction SECTION 3.4 CLASS ACTIVITY 3-P Critiquing Mixed Number Addition and Subtraction Methods CCSS CCSS SMP3, 5.NF.1 1. Each of the problems that follows shows some student work. Discuss the work: What is correct and what is not correct? In each case, either complete the work or modify it to make it correct. Use the student's work; do not start from scratch. a. Subtract: 34 - 14. student 1: 2 student 2: 17 b. There are 23 cups of milk in a bowl. How much milk must be added to the bowl so that there will be 3 cups of milk in the bowl? W 2 2+ 23 23 2 more c. There were 5 pounds of apples in a bag. After some of the apples were removed from the bag, there were 34 pounds of apples left. How many pounds of apples were removed? 15 4 4 4 flf 4 d. Add: 23 + 13. 23 + 13=3# because the fraction part is 4 out of 6. 2. Find at least two different ways to calculate 15 - 45 and to give the answer as a mixed number. In each case, explain why your method makes sense