Two routes in
6 × 8 is the 3 table doubled: 3 × 8 = 24, and 24 doubled is 48. Or it is five sixes and three more sixes: 30, then 36, 42, 48. Both routes are worth showing, because children do not all find the same one easy, and a child with two routes is never stuck.
Most of it is already learned
By the time a child reaches the 6 table they know 6 × 1, 6 × 2, 6 × 5 and 6 × 10 from those tables, and 6 × 3 and 6 × 4 from the 3 and 4 tables. What is actually left is 6 × 6, 6 × 7, 6 × 8 and 6 × 9. Four facts, not ten, and telling a child that changes how the week feels.
The one that sticks
6 × 7 = 42 is the fact this table is remembered for, and it is worth learning on its own, out of order, before the rest. A fact learned by itself is stronger than the same fact learned eighth in a chant.