Elena used math facts as an anchor to find the sum of 5 and
7. Her work is shown.
In which step did her first error occur?
Step 1: The phrase "sum of means addition,
Step 2:5 + 5 = 10
Step 3: Since 7 is 2 more than 5, 2 more need to be added to
10.
Step 4: Therefore, 5+ 7 = 8.
Step 1
Step 2
Step 3
Step 4