Perfect suggestion, thank you!

Her understanding of what the question is asking seems correct in side by side OR over under, as is her approach to multiple forms of writing out subtractiong with re-grouping. But when she solves the smaller parts of the question (11-7, 8-5, etc) in her head she takes an obscenely long time and is wrong at least half the time. Zero problems doing it with beads, though we've not done it a lot. she seems annoyed by the beads and to want to do it in her head but then to go horribly wrong.

Edited to add that she clearly understands what is happening in a drawn representative of 83-29, but will still choose to work out the ones in her head and get them wrong.

Last edited by MumOfThree; 09/15/13 08:34 PM.