Today I decided I like to memorize numbers
in a different way than usual.
(I memorized 12 atomic weights out to many digits from IUPAC,
but am getting weary, so I am trying a new approach for some
more of the elements)
Say the number to be memorized is a line from a suduko puzzle:
291 736 584
Instead of memorizing from left to right,
take advantage of your ability to
remember approximate locations of each
number as you count from 1 to 9.

So you learn it by writing on paper
like this:
    1

2   1

2   1    3

2   1    3                4

2   1    3         5     4

2   1    3       6  5    4
2   1 7 3       6  5    4
2   1 7 3       6  5 8 4

2 91  7 3       6 5 8 4
As a double check, say the final answer
a few times also, so it will sound
familiar to yourself if you get it right.