families is too many, and you would prefer to do only a few - or perhaps your
students are just becoming competent at the activity when they finish the ten
families, and you will make up more of your own.
decide to give ten CALCULATIONS sheets to each student, you might feel that
that's too much paper (even double-sided). If so, you could put the
CALCULATIONS form on an overhead transparency (either on an overhead projector
or not), and have students use erasable markers.
create a computer spreadsheet that would do the calculations, requiring the
students only to type in each family's children and their ages.