DIV is an integer division in programming where you take only the whole number. EG 18 DIV 5 = 3. How do you make 18 subject of the formula? say you have this question: a DIV b = c (a) Also there is another function which is called MOD which returns the remainder of 2 numbers. EG 18 MOD 5 = 3. The previous question has to do with making *this* 18 subject of the formula (18 MOD 5 = 18-5[18 DIV 5]) so if you can answer this there's no need to answer the previous question. a MOD b = c (a) 10x!