when you multiply something with 1, that number stays the same ( 5x1=5)
when you divide something by 1, that number again stays the same because 1 goes into it that many times. ( 7/1=7)
when you multiply something by 0, it doesn't matter what number, but that number becomes 0. (4x0=0)
when you divide something by zero, it doesn't matter what number it is, it is "undefined" (5/0=undefined(not a number))
but when you have 0/5 (not 5/0) it becomes 0, just like multiplication.
when you have 1/5 (not 5/1) it becomes a decimal, like 0.2. (1/5=0.2)
hope this helped :)
