The easiest way to multiply by ten is to annex the zero
1x11=11
10x11=11 plus the zero on the end.
110
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(5)21 x (4)11 = (5)11 x (5)10 x (4)11 = (5)10 x (5 x 4)11 = (5)10 x (20)11 =(5)10 x 20 x (20)10 = 20 x (5 x 20)10 = 20 x (100)10 = 2 x (10)1 x (10)20 =2 x (10)21 = 2,000,000,000,000,000,000,000
2 x 10^11 x 2 x 10^11 = 4 x 10^22, or 40 sextillion
233.3333
Any 4 from 11 is calculated as 11!/(11 - 4)! x 4! The ! sign means factorial so the calculation simplifies to (11 x 10 x 9 x 8)/(4 x 3 x 2) = 11 x 10 x 3 = 330.
11 = (1 x 10) + (1 x 1)