In the boys' classroom at Lamplighters Yeshivah in the Hasidic Jewish stronghold of Crown Heights, Brooklyn, Montessori number-counting boards and decimal beads share space with Hebrew-learning materials. A colorful timeline on the wall shows two strands of world history in parallel: secular on the left, Jewish on the right.

A photo of the grand rabbi of the Chabad-Lubavitch Hasidic movement hangs above a list of tasks that children perform individually: make a fractions poster, practice cursive, learn about the moon's phases.

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Source: http://www.nytimes.com