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Strategic Mental Math versus Calculator Use
Grade Level
ACT Prep
ACTM.006 Strategic Mental Math versus Calculator Use
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An item asks for the product of two matrices with entries 3.7, -1.8, 4.2, 0.6 and -2.5, 5.1, 1.9, -3.4. Which method is most efficient?
A
Estimation: round the entries and approximate the matrix product.
B
Calculator use: enter the matrices carefully and multiply, using estimation as a check.
C
Mental math: multiply and add all decimal entries mentally.
D
Written computation: set up all four dot products by hand.
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