(2)
8 3
x 5 7
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5 8 1 First, We multiply 3 by 7 =21 and then we place 1 at the end and we take the 2 and then we add that 2 to the result of 8 x 7 = 56 . Doing so, we take the 58 and locate it next to the 1.
(1)
8 3
x 5 7
------------
5 8 1
4 1 5 We multiply 3 by 5 =15 and then we place 5 at the end and we take the 1 and then we add that 1 to the result of 5 x 8 = 40 . Doing so, we take the 41 and locate it next to the 5. Remember to leave a space below the unit of the first number.
Finally we add our two numbers according to the final position
5 8 1
+4 1 5
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4 7 3 1