(1) Without the denominator - that is, without knowing how many total babies in the home birth group had congenital heart problems to begin with - the comparison to hospital births is meaningless.(2) For the technically minded, you calculate a percentage by dividing the numerator by the denominator and multiplying by 100.(3) In other words, a number is rational if we can write it as a fraction where the numerator and denominator are both integers.(4) If you calculate the divergence for different species of plants, you find that both the numerator and the denominator are usually Fibonacci numbers.(5) Strictly, all whole numbers can be written as fractions if we make the denominator (the part below the line) equal to 1!(6) For each genus examined, the nominator gives the number of studied species and the denominator includes the total number of species.(7) Our data represent an approximate denominator of 6000 athletes and shows a 10-year incidence of 1% stress injuries to bone.(8) The denominator for each rate is based on the census that takes place every 10 years, which helps us calculate how many males and females there were in each age band the UK in 1999.(9) To convert a fraction to a percentage, divide the numerator by the denominator .(10) We obtained data from the Russian State statistics committee, including deaths by cause, sex, five year age group, and calendar year together with corresponding population denominators .