The present paper questions the validity of Macnamara's (1966) finding that teaching arithmetic through a bilingual's weaker language leads to retardation in problem arithmetic. By comparing the performance of immersion pupils on an Irish (as a second language) version of the problem arithmetic test with the performance of non-immersion pupils on…

The results of the evaluation of the French immersion program at a school in a unilingual English environment are described. A battery of tests was administered to a random sample of children from the kindergarten and grade one experimental French immersion classes and to a comparison group composed of children following the regular English…