I am sponsoring a 6 y/o girl in Rwanda and my daughter is corresponding with a 6 y/o girl in Togo. We are building up a stock of goodies to include w/their letters that we send to them. There are lots of inexpensive kindergarten workbooks available.I thought the math type might work best d/t language barriers. Would these be appropriate? I don't want to send something below the child's learning level. I can just hear my own kids saying, "Mom, I'm not a baby!"