Làm toán bằng cách “múa” ngón tay
(TNO) - Chỉ với chiếc bàn tính hạt gỗ treo trên bảng, các bé ngồi dưới lớp học thực hiện động tác “múa” ngón tay, tưởng tượng sắp xếp các hạt gỗ để tính được những phép toán trong thời gian ngắn.
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