got 72 cups divided by 12 – i need 6 cans of rice, 6 no. 10 cans.” in the next column – the fourth column – how much do you already have. it’s likely you already have a lot of these things. so, i got 4 cans of rice and in that column i am going to say where it is in my home, it’s in the master bedroom and when i purchase it, whatever the date was. and in the last column it’s what i still need to buy. if i need 6 cans and i have 4, i still need to buy 2 more cans of rice. so, 