Is did and attend a transitive or intransitive?

An intransitive verb is an action verb, expressing a doable activity like arrive, go, lie, sneeze, sit, die, etc. Unlike a transitive verb, it will not have a direct object receiving the action. Did and Attend are both words who are likely to have a direct object receiving the action; therefore they are likely transitive.

The two correct statements are:

All integers are rational numbers

Terminating decimals are rational numbers.