So do the public schools here, and we have 3 analog clocks in my house, but 3/4 of my children cannot read an analog clock, and 2/4 of them do not understand me

So do the public schools here, and we have 3 analog clocks in my house, but 3/4 of my children cannot read an analog clock, and 2/4 of them do not understand me when I say "quarter past" or "quarter to" no matter how many times I explain it.