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2. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Counting assigns a natural number to each object in a set, starting with 1 for the first object and increasing by 1 for each subsequent object. The number of objects in the set is the count. This is also known as the cardinality of the set. Counting can also be the process of tallying, the process of drawing a mark for each object in a set.

3. Number line - Wikipedia

   en.wikipedia.org/wiki/Number_line

   The order of the natural numbers shown on the number line. A number line is a picture 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.

4. Consanguinity - Wikipedia

   en.wikipedia.org/wiki/Consanguinity

   The number next to each box in the table indicates the degree of relationship relative to the given person. Consanguinity (from Latin consanguinitas 'blood relationship') is the characteristic of having a kinship with a relative who is descended from a common ancestor.

5. Tally marks - Wikipedia

   en.wikipedia.org/wiki/Tally_marks

   In the dot and line (or dot-dash) tally, dots represent counts from 1 to 4, lines 5 to 8, and diagonal lines 9 and 10. This method is commonly used in forestry and related fields. [ 6 ]

6. List of primary education systems by country - Wikipedia

   en.wikipedia.org/wiki/List_of_primary_education...

   In second and third grade students are assessed on subjects including Latvian language, minority language, math, and foreign languages and are graded using the 10 point scale. In fourth grade through ninth grade students begin being assessed in all subject areas and are graded using the 10 point scale.

7. List of types of numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_types_of_numbers

   All integers are rational, but there are rational numbers that are not integers, such as −2/9. Real numbers (): Numbers that correspond to points along a line. They can be positive, negative, or zero. All rational numbers are real, but the converse is not true. Irrational numbers (): Real numbers that are not rational.