Which statement best explains whether or not a calculator is the most efficient way to simplify (0.68 – 0.38 – 0.2) × 2.3? Multiplying the amount in the parentheses by 2.3 will be a time-consuming process, so using a calculator would most likely be more efficient. Some of the decimals are to the tenths digit and others are to the hundredths, so using a calculator would most likely be more efficient. The calculations inside the parentheses are easily done by hand and yield a value easily multiplied by 2.3, so finding the solution by hand would most likely be more efficient. Multiplying any number by 2.3 can be done quickly by hand, so solving this problem by hand would most likely be more efficient.
