Originally Posted by Irena
Dude see attached chart and annerberg link. Whether you agree with the chart or not, it lays it out very clearly. If the problem wanted, as an answer, a "difference" and a "subtraction" sentence, it should have asked for that and it should have instructed the student to write a "separating story" rather than a "comparing story." However, the instructions read, "Write a comparing story....Write a number sentence that solves the story." The very problem and answer DS gave as his answer is in chart as correct and a model answer!

To write a "number sentence that solves the story," it would be necessary to express it in the form of OPERATION = SOLUTION. That's not what your son presented.

Whether you call it a "separating story," a "comparing story," or a bedtime story, the solution is still 10, so it's just semantics.