Tricky math problem!

I added an extra tricky problem solver today! The hairbow story with Mia and Marie can be done with base ten strategy! 19+19+?+?=89... Solve 19 +19. Then take away the 38 from 89=51.If the kids draw base ten they know how to "fair share" for 2 friends... The tricky part is they have to give Mia her 5 extras first, then fair share so 51-5=46. Then both Mia and Marie gets 2 tens and 3 ones. I am really just trying to get the kids to rely on the strategies. Id they don't get the right answer I'm cool with that since i'll just be looking at theirefforts and strategies used.


Here is a great sample of 1 of the kid's 1st attempt! He was trying the guess and check, 31&30... Then got a little worried about being wrong, but awesome steps to this point!