1. Support Materials
Although the answer key matches the prompt by representing each problem with a tape diagram, 2.OA.C.4 does not require that representation of repeated addition. For 2a and 2b, the student finds the correct total without using the tape diagram model. It would be interesting to know whether the student chose not to use the tape diagram because the student did not feel the need for it or because the student did not, or could not, read the prompt.
2.OA.C.4: Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns, write an equation to express the total as a sum of equal addends.
The student draws pictures for c and d, where the equal groups are represented with words rather than equations. These pictures are accurate representations of the equal groups described, and the repeated addition equations are correct. It is possible that the student needed the visual model in order to write the addition equation and find the sum or that the student does not understand what a tape diagram is.