32 × 21=?

First digit of first #
Multiplied by first
Digit of last number= 6

2nd digit of 1st #
Multiplied by last
Digit of last number = 2

Now multiply 1st digit
3 by ( last digit) 1 & it =3
2nd digit of 1st # which
Is 2 × 1st digit of 2nd #
Which is 2 & you get 4
Add 3 +4
=7
Insert 7 between the 6 and 2
You get 672
32×21=672