Which is the better 18 cans of cat food for $15 or 12 cans for $9

18 cans = 15 dollars

18/18 cans = 15/18 dollars divide both sides by 18

1 can = 0.83 dollars

1 can = 83 cents <<--- first deal

12 cans = 9 dollars

12/12 cans = 9/12 dollars ... divide both sides by 12

1 can = 0.75 dollars

1 can = 75 cents <<--- second deal

The first deal costs 83 cents per can.

The second deal costs 75 cents per can.

The second deal is the better offer, since it's cheaper per can

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490