They can quickly learn that it is easier to count sets grouped by tens and then whatever loose ones may be left over than it is to count by ones.
(They; can quickly learn; that it is easier to count sets) (it; is; to count by ones) (sets grouped by tens and; may be left over; T:then)
They it sets grouped by tens and
can quickly learn is may be left over
that it is easier to count sets
to count by ones
T:then