Adding and subtracting :
Merttens, Ruth
Adding and subtracting : activities on addition, subtraction, measure and money / by Ruth Merttens ; illustrated by John Farman. - [s.l.] : Octopus pub. Group, 1987. - 31 p. ; col. - The Parent and Child Program .
1-85270-010-6
Addition -- study and teaching
Subtraction -- study and teaching
TR(GS 513.2 / MER 1987
Adding and subtracting : activities on addition, subtraction, measure and money / by Ruth Merttens ; illustrated by John Farman. - [s.l.] : Octopus pub. Group, 1987. - 31 p. ; col. - The Parent and Child Program .
1-85270-010-6
Addition -- study and teaching
Subtraction -- study and teaching
TR(GS 513.2 / MER 1987