Mental maths : skills & strategies /
Woods, Andrew J.
Simonds, Lucy.
Oxford : Oxford University Press,
2004, c2002.
Originally published: Melbourne : Oxford University Press, 2002.
Adapted text written by Lucy Simonds.
bk. 1 -- bk. 2 -- bk. 3 -- bk. 4 -- bk. 5 -- bk. 6.
Mental arithmetic
Mental arithmetic