ERIC ED622657: Teachers Magazine. Volume XXXV (1913)
ERIC · leaf 324
16. How many cubic inches make one cubic foot ? Drill Problems in Mental Arithmetic. 17. Llow many cubic inches make one gallon? The following sets of mental drill problems are 18. How many square inches make one square those now used by the Edison Phonograph Com- foot? pany. ‘Ihese problems have…
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