The children were divided into groups and they were taught basic math with Direct Instruction (Stein, Silbert og Carnine, 1997), another instructional method or got no intruction for 12 weeks.
Börnin fengu ýmist Beina Kennslu (Direct Instruction) (Stein, Silbert og Carnine, 1997), aðra kennslu eða enga kennslu í stærðfræði í 12 vikur.