If a child's homework was 10/4=?, 8/2=?, 66/3=? etc, I would describe the homework as division sums.
More a British term? I'd just say that the child had division homework - to me, "sums" refers specifically to addition.
Yes, it probably is British. To me "sums" is basically primary school maths, so basic addition, subtraction, multiplication, division, fractions etc. It's the sort of maths you can easily do longhand without the use of a calculator.
This is geared so heavily to British English speakers. I don't understand some of the English stuff at all