6 × 7
What is six times seven?
Here's a fast trick: six is double three.
So let's start with a fact we know: three times seven is twenty-one.
Since six is double three, six times seven is double three times seven.
Doubling twenty-one means twenty-one plus twenty-one, which is forty-two.
Let's double-check by skip counting by sixes, seven times: six, twelve, eighteen, twenty-four, thirty, thirty-six, forty-two.
Six times seven equals forty-two. Great work!