"... #12 [does] not make sense. Shouldn't a subtraction sentence have a subtraction symbol in it?" I have a kid who went through this curriculum, and yes, a su

"... #12 [does] not make sense. Shouldn't a subtraction sentence have a subtraction symbol in it?" I have a kid who went through this curriculum, and yes, a subtraction sentence needs a "-" sign in it. The idea of a "related subtraction sentence" is a standard thing in this curriculum. I think #12 is the worst question on the test, because it is flat-out wrong. Like I wrote elsewhere, I'm ok with "number sentence" because of the parallel with regular sentences. It gets the kids familiar with the idea that the math is making assertions. I TA'd several undergrad engineering classes (at a top-10 engineering school) and you'd be surprised how many students did not use the equal sign in their work. They would write one expression down, and then another under it, and another beside that one, etc., but without equal signs, it's just babbling.