Very cool, basically a visualization of the standard multiplication technique. For ##x## it really helps for the 2nd step. A number like 18x31 is really quick

Very cool, basically a visualization of the standard multiplication technique. For ##x## it really helps for the 2nd step. A number like 18x31 is really quick to do building backwards with this, 8, 25 ,3; so 558. With more rounding, I think my traditional method of rounding and taking into account the difference is better, 99x99 being the worst case example. I imagine if you practiced even a little you could do 2x2 and 3x3 numbers in a snap.