I grew up in the 50s and 60s. Math was my best subject.
A combination of age and using calculators for 40 years has ruined my ability.
BTW I was in Wal-Mart the other day and they had a calculator for a dollar! It looked sort of plastic but it had a solar charger built in.
You can’t buy the battery for that.
“BTW I was in Wal-Mart the other day and they had a calculator for a dollar! It looked sort of plastic but it had a solar charger built in.
You can’t buy the battery for that.”
It don’t have no battery! It has to be (minimally) in a lit room to work!