Repeating decimals. 1  Converting a fraction to a repeating decimal. 2  Practice: Writing fractions as repeating decimals. 3  Converting repeating decimals to fractions (part 1 of 4  2) Practice: Converting repeating decimals to fractions 5  1. Converting repeating decimals to fractions (part 2 of  2)
hydatid mole , hydatidiform mole an abnormal pregnancy characterized by placental abnormality involving swollen chorionic villi, which form a large, grapelike mass of vesicles, by trophoblastic hyperplasia, and by loss of fetal blood vessels in the villi.
What is the mole? The mole is the SI base unit that measures amount of substance. The symbol for amount of substance is n. By definition, the mole contains a defined number of entities (usually atoms or molecules). This number is called 'the Avogadro constant' (N A). The mole is used to describe a practical quantity of material.