Fourth grade, where the abstraction lands
Somewhere around nine, a child who has spent years building mathematics out of physical materials stops needing them. The beads go back on the shelf and the work continues on paper — not because the child was told to, but because carrying the materials around has become the slow way to do it.
What “fourth grade” means in a mixed-age classroom
Montessori classrooms are deliberately mixed-age, so “fourth grade” is a translation rather than a room. Your child is not in a class of thirty children born the same year, moving through the same page on the same morning. They are in a community spanning about three years, working at the level they are actually ready for — which for most children means ahead in some subjects and still consolidating in others. What follows is what the fourth-grade year typically looks like inside that structure.
The fourth-grade year at Mills
- The handover from concrete to abstractThis is the transition the whole material sequence was built for. A child who understood why an algorithm works before memorising it tends to abandon the materials on their own, and to be able to reconstruct the method later when they have forgotten the steps — see control of error.
- Decimals, ratio, squaring and cubingThe mathematics of the upper elementary years goes considerably further than a grade-level chart suggests, because a child who is ready is not made to wait for the calendar.
- Work that runs for weeksProjects at this age are long, self-managed and presented publicly. Managing your own time across three weeks is a skill middle school assumes and rarely teaches.
- Nine-year-olds are relentlessly social, and that is usedGroup work is the default rather than a reward. Work gets negotiated, argued over and divided up — which is closer to how adults work than a silent row of desks is.
- Still the same school, the same teachers, the same hillA fourth-grader at Mills has usually been in this building since they were two or three. Continuity of adults is not a curriculum feature, but nine-year-olds notice it.
Schedules and rates for elementary
Elementary rates are the same across every elementary year. Elementary runs as a full day or an extended full day — there is no morning-only elementary place on the published schedule. If you need something else, call the office at 650-616-9000 and ask rather than assuming either way.
| Schedule | Hours | Per month |
|---|---|---|
| Full day | 8:45 am – 2:30 pm | $1,400 |
| Extended full day | 7:30 am – 6:00 pm | $1,750 |
Monthly amounts. Annual tuition is based on a 180-day school year and may be paid in full for a discount — 5% before May 1st, 3% after — or in ten installments. A $450 annual materials and testing fee applies to kindergarten and elementary, plus a one-time $200 enrollment fee for new students.
- AgesAges 9–10
- HoursMonday to Friday, 7:30 am to 6:00 pm.
- WhereOne campus, 1400 Hillside Blvd., South San Francisco, CA 94080.
- EnrollmentOpen year-round, subject to availability.
- LicensedCalifornia Department of Social Services facility #414002135, ages two through fifth grade.
The year before and the year after
- Before this yearMontessori Third Grade — ages 8–9.
- After this yearMontessori Fifth Grade — ages 10–11.
- The whole programMontessori elementary at Mills, kindergarten through fifth grade.
What parents ask about fourth grade
- Every directory says this school only goes to second grade. Which is right?Mills teaches through fifth grade — that is what the school does, and the elementary program has run for years. The listings you have seen inherited a stale state record and the school is working on correcting it. If it matters to your decision, and it should, call 650-616-9000 and ask directly, or come and see the elementary classroom on a tour.
- Is fourth grade at a Montessori school going to leave gaps?The honest answer is that we will not claim outcomes for your child. What we can show you is the work: come and look at what fourth-graders here are actually producing and compare it with what you have seen elsewhere.
- What happens after fifth grade?Children leave at the end of fifth grade for public and private middle schools. See fifth grade for how that year is used.
Come and watch the elementary class work
Tours run mid-morning during the work cycle, year-round, by appointment.