0/0 = undefined because can’t divide anything by 0, not even 0 itself.

72/x=9

72/9=8, therefore x=8

88/x=11

88/11=x, therefore x=8

0/8 =0

72/8=9

88/8=11

not much to explain with the process, just look for the relationship between the numbers; do you add, subtract, multiply or divide by the same number each time?

Look for ones that are obvious, like 10’s and 0’s and 1’s and such. For example, the 0 0 said it wasn’t addition or subtraction, but had to be multiplication or division, since that’s how you keep a zero a zero. And 88 being a multiple of 11 was fairly obvious to me, 72/9 was a little less clear. Look for the obvious one and see if the others relate.