In the car just now, Anna was counting the barrels in a construction area we went through.  She counted all the way up to 49 without any help at all!  I was amazed!  After 49 she said 60, so that was close.  She’s been able to count very consistently to 29 and most of the time she’ll get to 39 but then she’d start saying random numbers (like 40, 80, 90, 70, etc).  We’ve been counting up past 100 with my help at the “ten’s” (30, 40, 50, 60, etc.) so she gets the concept but just couldn’t remember what order the “ten’s” came in.  I was so surprised though.  It’s amazing how fast they learn things at this age.  Next up, differential equations.