If a 16oz bottle sells for $8 and 128oz cost $ 53 which has the lower cost

Question

Division and multiplication

Answer 1

Unit cost of the 8oz bottle=8/16=$0.50 per ounce.

Unit cost of the 128oz bottle=53/128=$0.41 per ounce (approx).

So the larger bottle (128oz) has lower unit price.

Another way of looking at it is to note that 128=8×16 so if the unit prices were the same the larger bottle should be 8 times the cost of the smaller bottle: 8×$8=$64, but it's only $53, is it's cheaper according to the unit cost. The arithmetic here is easier than calculating the individual unit costs.