Palindromath

Last post concerned one a middle-school daughter. This one stars her little sister, who likes to add things (like, we will wake up early tomorrow and she'll want to play yahtzee).

Some previous week she was just sitting there making me make up addition problems. And eventually I rolled around to twelve plus twelve, which is more than she wants to count to in her head, so she wrote it down, and figured it out. I was proud.

12  + 12 = 24

Only for some reason she wrote each digit backwards. Which made older daughter and I, who as you may recall had been engaged in discussions of Leonardo (who could write in mirror letters, and numbers too I guess, but I ain't gonna check), look at it backwards

42 = 21 + 21

Cool. 42, of course is also the answer to the meaning of life, the universe, and everything. What makes a dad prouder than when his girl is good at math and enjoys doing it? Maybe when she generates cool mirrormath...