
We're working on place value around these parts - mostly solidifying that when you are doing stacked math, you are really subtracting a ones, tens and hundreds column instead of all ones lined up. To help us understand that a bit, I made 20(!) origami paper boxes to represent our tens, got 2 box tops to represent hundreds (because 10 of the little boxes fit in them nicely) and of course acorns for the ones. What you see here represents 148 acorns 1 box top (filled with 10 origami boxes of 10 acorns each), 4 origami boxes of 10 acorns each and 8 acorns on their lonesome. This was the starting setup for 148-52:
The solution, as you are aware I'm sure, is 9 origami boxes with 10 acorns each and 6 acorns.


















