DIT Math Structures Name Math 3603 Activity 31 (Modified): Why the Standard Algorithms for Addition and Subtraction Work with Base-10 Math Drawings (Two-Digit Numbers) The hypothetical student work in this activity is similar to actual first grade students' work. These urban Latino first graders performed substantially above first graders of higher socioeconomic status and older children. 1. Examine and discuss student I's work. Explain how the student did Student 1: the problem. 65656 27 + 38 111 0 0 56 D 65 Examine and discuss student 2's work. Explain how the student did Student 2: the problem. 27 +38 65 3 . Examine and discuss student 3's work. Explain how the Student 3: student did the problem. 10 20 27 30 40 ED 58 51 606) 62 63 64 65 +38 65 4. Compare the methods of students 1 and 2 for adding 7 and 8