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NCERT, . (2010). Mathematics: Teachers' Training Manual : for classes 1 & 2. New Delhi: NCERT.
NCERT, . 2010. Mathematics: Teachers' Training Manual : for classes 1 & 2. New Delhi: NCERT.
NCERT, . Mathematics: Teachers' Training Manual : for classes 1 & 2. New Delhi: NCERT. 2010.