I started my 8-year old second grader on Redbird math. She has not gotten any above grade level instruction but seems to know almost all second grade and third grade material. She will panic and cry if she thinks something is too hard so I started her at second grade level. There are some things like addition models? that she is not familiar with. Well she thinks they are stupid and says that she uses her brain to get the answers and not any strategies, tables or lines. I'm wondering if she will run into trouble if I will advance her to third or fourth grade. She knows multiplication to 10 (and more) and division of course as well so I know she does not want to do those again. Do the kids need these different strategies later on the program or can they "just use their brain"?