Explain how to use estimation to find the product of two decimals. give an example with both estimated and actual answers

Strategy 1:  Round both factors to the nearest one.Strategy 2:  Round one factor up and one factor down.The estimated product is $112.The estimated product is $100.
Using the first estimation strategy, it will cost about $112 to fill your gas tank. Using the second estimation strategy, it will cost about $100 to to fill your gas tank.If gasoline costs $6.50 per gallon and your gas tank holds 15.5 gallons, then about how much will you pay to fill your tank?