Starting off with adding and subtracting /
Patilla, Peter.
Starting off with adding and subtracting / by Peter Patilla. - Oxford : Oxford University Press, 2000. - 32 p. : ill., col ; 25x25 cm.
0199106681
Addition.
Arithmetic.
Subtraction.
Starting off with adding and subtracting / by Peter Patilla. - Oxford : Oxford University Press, 2000. - 32 p. : ill., col ; 25x25 cm.
0199106681
Addition.
Arithmetic.
Subtraction.