The Mesopotamians passed their base-60 numerical system to the ancient Egyptians, who used it to divide a circle into 360 degrees, Mary Blocksma writes in her book Reading the Numbers. The 360 ...

Together the 3 one-thirds are equal to the whole. This group of 12 children has been divided into 4 groups. There are 3 children in each group. Each group is a quarter of the whole. The shape has ...