00420cam a2200145 i 4500 084656713X DLC 512 CUM 1975 A032 Or. 513/.2 Siner, Helen B. Practical mathematics : decimals, ratios, proportions, and percents / Menlo Park, Calif. : Cummings Pub. Co., [1975] 104 p. : ill. ; 24 cm. Arithmetic. EK 12166 12166 0 0 0 512_000000000000000_CUM_1975_A032_OR 0 61439 LBA LBA A032 2017-08-10 512 CUM 1975 A032 Or. A18418 2017-08-10 2017-08-10 EK