In the examples below, can 'some' be replaced with 'about', 'around'?
And also, are sentences below a correct usage of the word 'some'?
1) Some hundred people
2) annual production of some 35 million units
3) In 13 months, I flew to 14 countries and gave some hundred talks
4) he found his teen pal some 50 years later
5) annual production of some 35 million units