Speed mathematics : secret skills for quick calculation /
Handley, Bill, 1943-,
Speed mathematics : secret skills for quick calculation / Bill Handley. - xiii, 256 pages.; 23 cm.
Includes index.
0471467316 Hadiah
Mental arithmetic.
Speed mathematics : secret skills for quick calculation / Bill Handley. - xiii, 256 pages.; 23 cm.
Includes index.
0471467316 Hadiah
Mental arithmetic.
