math
posted by sam .
meredith wants to paint 3 of the walls in her room each wall has the shape of a rectangle with dimensions 10 feet by 12 feet she has 1 can of paint that will cover approixmately 420 square feet which method can meredith use to determine whether or not she has enough paint to complete the job?

math 
PsyDAG
Figure total number of square feet. Is it more or less than 420?
10*12*3 = ?
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