### Math oddities

Oct. 4th, 2010 02:05 pmThis morning, Erika had no trouble solving any problem within 10, including missing addend problems and subtraction problems. In response to problems like this:

4 + ? = 9

She was saying things like, "well, it can't be 4 + 4, because that's 8, so it must be 4 + 5." In response to problems like this:

7 - 3 = ?

She would say, "I know that 3 + 4 is 7, so the answer must be 4."

She was on a total roll.

The only problem she did have trouble with was this one:

8 - 3 = ?

She answered 11, because she hadn't noticed that it was a subtraction problem.

Learning is weird.