One of the sailers came in he made 28 donuts for 7 people he said they get 13 each.Another sailer said "28 / 7 does not = 13." So the first sailer tryed to prove it by drawing it out. So he did 28/7 he put 7 into 28 1 time then put one in the quotent. Then he put 3 sevens into 21 so he got 13.  He was wrong because he first acted like the 1 was a ten. Then he did 13*7. 3*7=21 and 7*1=7 so he then added 21 to 7 and got 28. He got that wrong because he put no place holder in the problom. He wanted to try and prove it one more time so he did 13+13+13+13+13+13+13 he first added the threes like 3*7 then he added the ones like 1*7 he added them and got 28 eight again. He was wrong there because he acted like the tens were ones again like in the division problom.