My DD6 is doing Addition Flash Cards. Here's her thinking.
9+5=?
so 5+5=10 and 4 left over from 9,
so 10 + 4 = 14


With 9 addition it's always one less than number added.
She doesn't want to hear the short cut and got mad at me for suggesting it. I didn't want to insist and just said there is more than one way to get an anwser. Why would she choose the long way? She is doing great with her + & - facts. I wonder about this. I feel like there is something happening that I don't get. Her brother DS9 is doing something with his 4 digit to complicate his computation too. Both are gifted kids. DS is probally hG or PG in math. Am I overthinking this? Please offer suggestions. Thank you in advance.