There are seven numbers from 0 to 6 in the first grade mathematics. Between 0 and 6, including 0 and 6, there are 7 numbers * * *. This is because the counting habit starts from 0, so 0 is also one of the numbers. Starting from 0, each increment of 1 will record a number until it reaches 6. Between 0 and 6, there are seven numbers: 0, 1, 2, 3, 4, 5, 6.