Lake Superior, the largest of the Great lakes, has an area of 31,760 miles ². Lake Erie, the smallest of the Great Lakes, has an area of 9,920 miles ². About how much larger is Lake Superior than Lake Erie?
How would you solve this problem?
What does “ABOUT” mean here?
9.
Section 3.2: Estimating Decimal Products and Quotients
Estimating the products and quotients of decimals is a good way of checking mental math.
Multiplying Decimals: Estimate using any method.
Dividing Decimals: Round the Divisor, Round the Dividend (to a compatible number), then Divide!
Shari is planning a 450 miles car trip. Her car can travel about 39 miles on a gallon of gasoline. Gasoline costs $1.19/gal. About how much will the gas cost for her trip?
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