Can a student in my class do activities in a language different from the rest of the class?

Yes. Matific supports more than 40 languages. 

1. Click 'Class Management' -> Manage My Students.

2. Select your class.

You can change the language per student/for multiple students.

Change language per student

3. Click the ellipsis icon next to the student whose language you wish to change.
    Click 'Edit Student Details.'
    Change language -> Click 'Save.'

Change language for multiple students

3. Select the students whose language you wish to change.
    Click the ellipsis icon at the top.
    Change language -> Click 'Save.'