1 x 52, 2 x 26, 4 x 13, 13 x 4, 26 x 2, 52 x 1
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104
* Multiply by 10 (by addind a zero to the right of the number), * then double: Example - multiply 52 by 20: 52 x 10 = 520 double 520 = 1040
For examplr: 4*13 = 52
40*52 = 2,080. If you need to calculate this in your head, an easy way is to first multiply 52 by 4 instead of 40. That will give you an answer of 208. Then you can multiply by 10 to get 2,080.
1 and 52 2 and 26 4 and 13