首页>
外国专利>
Base--ten blocks employing single, attachable blocks of one color row of ten blocks of different color
Base--ten blocks employing single, attachable blocks of one color row of ten blocks of different color
展开▼
机译:基本-十个块,使用一个颜色行的单个可连接块,十个不同颜色的块
展开▼
页面导航
摘要
著录项
相似文献
摘要
Base-ten blocks for teaching arithmetic to children, in which each block (19) has a projecting boss (27) with curved (bowed-out) sides (29) and an aperture (33) with straight sides (35), so that blocks (19) can be securely joined together to form multiples of units. A row of integral blocks (37) has common wall thicknesses (42) between adjacent blocks equal to twice the thickness of the end wall (45) of the row so that the row can be correctly mated with a row of single blocks or end-to- end rows of shorter blocks. Integral rows (37) of ten blocks each have two end bosses (41) for joining to other rows (37) to make flats (47) of one hundred units. Each flat has four bosses (51) for joining to other flats (47) to make a cube of one thousand units. The blocks have one color for units, a different color for rows of tens, a different color for flats of one hundred, and a still different color for cubes of one thousand. The blocks can be used to teach addition, multiplication, subtraction, division, etc., to children.
展开▼