# Tag Archives: Main Line Classical Academy

## Main Line Math Festival on April 22

On April 22, Golden Key Russian School and Main Line Classical Academy are hosting their fifth Main Line Math Festival for kids ages 5-12. Date: Sunday, April 22 Time: 4 PM – 6 PM Location: Temple Brith Achim, 481 S Gulph Rd, King of … Continue reading

## Fun with pentacubes

Today we started a unit on geometry with the second graders.  The first activity had them explore how many different structures can be made out of 4 snap cubes.  They very quickly came up with the five tetrominoes: After a … Continue reading

Posted in Uncategorized | | 4 Comments

## A number talk that turned into an investigation

It all started out with 12+12+12 a problem that was not particularly difficult for any of my 1st/2nd grade students.  The students took turns suggesting strategies for doing this computation and I recorded them on the board (this was an … Continue reading

Posted in Uncategorized | | 7 Comments

## Logical Fun, Part II

Here is the long overdue follow-up post to Logical Fun, Part I. The previous post left off with the following logic problem being posed to the students: A man is looking at a portrait.  A passerby asks him whose picture … Continue reading

Posted in Uncategorized | | 1 Comment

## Logical Fun, Part I

Once a week, I teach a joint math class at my school which combines children of ages 6-10.  For these lessons, I generally try to pick an activity that I can present as a series of “problems” of increasing difficulty … Continue reading

Posted in Uncategorized | | 2 Comments

## Playing with symmetry in kindergarten

In our kindergarten classroom, there is a big mirror that is usually covered by a giant map.  And for good reason!  As soon as the students find themselves anywhere near the mirror, it attracts them like a magnet.  They make … Continue reading

Posted in Uncategorized | | 1 Comment

## 3-digit numbers are tricky! Part II

This is a follow-up post to this one, about introducing 3-digit numbers to kindergartners. I start this lesson by asking the students to come up to the board one by one and write down consecutive numbers starting with 100.  There … Continue reading

Posted in Uncategorized | | 3 Comments

## 3-digit numbers are tricky!

For the past several weeks, our kindergartners have been playing with 2-digit numbers: they made numbers out of base-10 blocks, wrote them on the board, translated between the two representations, counted by 10’s from different starting points, and more.  We … Continue reading

Posted in Uncategorized | | 14 Comments

## Fibonacci Trees

For two weeks in a row, in our joint 1st-5th grade math classes, a certain famous sequence made its appearance.  The activities were seemingly very different: in the first one we were climbing stairs one or two steps at a … Continue reading

Posted in Uncategorized | | 1 Comment

## Time, symmetry, and unexpected turns

This is a story of how a kindergarten lesson on telling time turned into a lesson on symmetry.  It all started with a fun, colorful clock, with numbers 1 through 12 made out of shapes (some related to the number, … Continue reading