I've started incorporating another non-Montessori material into our curriculum -- Handwriting Without Tears. Nugget has recently developed an obsession with a wipe-off tracing book that we got her that shows letter formation, and she's been writing her name on her art projects. I love the jump, but I noticed that she wasn't getting very good direction from the tracing book -- for instance, she was making her "X" out of 2 'v's (one right-side up, one upside-down). So I picked up the preschool and kindergarten curriculums of Handwriting Without Tears. We've just started -- doing some crayon grip & scribble exercises as well as playing around with the letter shapes (I didn't buy the wooden ones; the teacher's guide has a pattern and I used craft foam).
This makes 3 core subjects for us. Phonics (via "Teach Your Child to Read in 100 Easy Lessons"), we do every day FIRM. We're up to lesson 30-something and she's reading two sentence stories in the book. Handwriting I'll be trying to get to every day or every other day, depending on how things are going. Math (following the Montessori progression, currently working on teens formation, the hundred board, and addition with the golden beads and number rods) I try to get to 3-5 times a week.
Last week and this week, Nugget has been attending an art camp at a local Montessori school. It's from 9am-1pm, and she comes home pretty drained emotionally. Because of that, I've backed us off to _just_ phonics on camp days.
We did math today, but it's the first time in a week. She did the hundred board solo (well, with Buzz Lightyear's help). She's been wanting me to "count to the speed limit" or "count to 100" in the car all the time lately, so I figured the hundred board would hit her right in the sensitive period. :) There was quite a push there at the end to make it all the way through, but she did it! (Just in time, too -- Sprout woke up from his nap not a minute later.)