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This chapter covers mathematics written in Hebrew between the eleventh and sixteenth centuries in Europe. It starts with the practical and scholarly—as well as earlier and later—Hebrew expositions of arithmetic, from Ibn Ezra's foundational twelfth-century The Book of Number, to Levi ben Gershon's early-fourteenth-century arithmetic. The chapter then follows with two discussions of combinatorics: Ibn Ezra's calculations of the number of possible conjunctions of a given number of planets from among the seven planets, and Ben Gershon's abstract and general discussion of permutations and combinations. Finally, this chapter discusses two important treatises that summarize geometric knowledge in a semi-practical style as well as measurements in a religious context.