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6

We don't say "subtract by" or "add by". 'by' is used with the verbs multiply and divide in sentences like: Divide 6 by 3 -> 6/3 6 divided by 3 -> 6/3 multiply 5 by 4 -> 5*4 5 multiplied by 4 -> 5*4 On the other hand, we can use 'to' and 'from' with the verbs add and subtract: Subtract 5 from 10 -> 10-5 Add 5 to 10 -> ...


4

This should probably be moved to math.SE, since I don't see anything here about teaching. But almost every line you wrote is incorrect English. "Add by" is gramatically incorrect. It should be "plus." "5 add 10" should be "5 plus 10" (or "5 and 10"). subtract by -> minus 5 subtract 10 -> 5 subtracted ...


2

This is a little long for a comment so it will have to be an answer. First, you should talk to your professor; I'm pretty sure that they will be able to definitively clear your issue up with a small amount of back-and-forth discussion. You seem to have trouble starting around your encounter with the word "define". I'm not really sure what we are ...


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