Tran, Tu Nguyet <br/><br/>
An introduction to the numerical operators in primary school / 
by Tran Tu Nguyet [and] Nguyen Thi Thu Nguyet 
 - Penang :  SEOMEO,  1974 
 - 123 p. :  ill. ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--1961-<br/>Mathematics--Study and teaching (Primary)--Vietnam