Totally correct. In the 90's as a kid in school using a calculator was highly debated amongst teachers and the ability to bring one out on your desk depended on the teacher.

In grade 2 i had a teacher who would say "I don't believe in erasers", you know, the things that "undo" pencil. As a ~6 yr old i actually didn't understand this phrase: "Well I have one, they're real!"