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Ninth grade is the ninth post-kindergarten year of school/education. Usually, it is the first year...

Ninth grade is the ninth post-kindergarten year of school/education. Usually, it is the first year of upper secondary school and the students are 14 to 15 years of age, depending on when their birthday occurs. In Australian states other than New South Wales, Australian Territory, Tasmania and Victoria, ninth grade is the second year of high school. In mathematics, the classes focus on geometry, substitutions and formulas, measurements and equations. In France, the equivalent grade is the troisième and is the final school year before high school In Ireland, it is the first year of Secondary School (for 12-13 year olds) which is year 9 of school. In New Zealand it is also called Year 10 or form 4, with students being from 13 to 15 years of age. It is the second year of secondary school (referred to as high school) In the English and Welsh education system the equivalent is Year 10, a relatively new terminology, replacing the 20th century traditional term Fourth Year being the fourth year of secondary education. In Northern Ireland, fourteen to fifteen year-olds are in Fourth Form (Year 11). In Scotland, it is equivalent to third Year, or S3. In the United States, ninth grade is