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The order of the natural numbers shown on the number line. A number line is a graphical representation of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely.
The Principles and Standards for School Mathematics was developed by the NCTM. The NCTM's stated intent was to improve mathematics education. The contents were based on surveys of existing curriculum materials, curricula and policies from many countries, educational research publications, and government agencies such as the U.S. National Science Foundation. [3]
Kindergarten [a] is a preschool educational approach based on playing, singing, ... The number of preschools grew steadily during the 1980s, peaking in 1990 with more ...
Fröbel's Gift 4, on a special gridded tabletop he also specified. The Sunday Papers (Sonntagsblatt) published by Fröbel between 1838 and 1840 explained the meaning and described the use of each of his six initial "play gifts" (Spielgabe): "The active and creative, living and life producing being of each person, reveals itself in the creative instinct of the child.
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In 1637 Descartes was the first to unite the German radical sign √ with the vinculum to create the radical symbol in common use today. [8] The symbol used to indicate a vinculum need not be a line segment (overline or underline); sometimes braces can be used (pointing either up or down). [9]