The fingers are a visual way to count, but it tends to be only effective in the initial stages of childhood. As students, encounter bigger numbers and mental prowess is needed for calculations, relying on finger counting can prove to be a setback as it can discourage the mental math development of a child.
Being able to visualise equations in your mind is known as mental math. For example, the equation 25 – 9, a student who sees the equation in their mind might see it this way 25 – 10 (-1), while those who finger count might need to utilise their toes and their friend’s fingers for this equation.