Ralph: Dad, will you do my math for me tonight?
Dad: No, son, it wouldn’t be right.
Ralph: Well, you could try.
Teacher: Ralph, if your father had 10 dollars and you asked him for six dollars, how many dollars would your father have left?
Teacher: You do not know your math.
Ralph: You do not know my father.
These jokes first appeared in Boy’s Life magazine. The first joke is from May of 1973. I do not know when the second was published.