An airplane can travel at a speed of 400kmph to 9000kmph.
Brazil has recently gone through changes in school grades. Currently, at the age of 6 children attend from the grade 1 to 4 what is called Ensino PrimÃ¡rio (Portuguese for Primary Teaching, or Primary School), and afterwards from grade 5 to 9 the Ensino Fundamental (Fundamental Teaching/School).
Therefore, in the Singapore MathÂ® program, the word elementary is not to be confused with the Primary grade levels of 1st through 6th. These two terms are not synonymous. In the Singapore system, their Elementary Mathematics Syllabus is their Secondary program.