arrays and an expanded algorithm 23*17

Answer 1

log ( a * b ) = log a + log b

log ( 23 * 17 ) = log 23 + log 17

Answer 2

23 x 17

10 x 20 = 200

10 x 3 = 30

7 x 20 = 140

7 x 3 = 21

200 + 30 + 140 + 21 = 391

23 x 17 = 391

Answer 3

expanded algorithm