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2. Number line - Wikipedia

   en.wikipedia.org/wiki/Number_line

   A number line is usually represented as being horizontal, but in a Cartesian coordinate plane the vertical axis (y-axis) is also a number line. [5] The arrow on the line indicates the positive direction in which numbers increase. [5] Some textbooks attach an arrow to both sides, suggesting that the arrow indicates continuation.

3. Tally marks - Wikipedia

   en.wikipedia.org/wiki/Tally_marks

   In the fifth row the fifth mark crosses diagonally, forming a "five-bar gate". Tally marks are typically clustered in groups of five for legibility. The cluster size 5 has the advantages of (a) easy conversion into decimal for higher arithmetic operations and (b) avoiding error, as humans can far more easily correctly identify a cluster of 5 ...

4. Counting rods - Wikipedia

   en.wikipedia.org/wiki/Counting_rods

   In 1954, forty-odd counting rods of the Warring States period (5th century BCE to 221 BCE) were found in Zuǒjiāgōngshān (左家公山) Chu Grave No.15 in Changsha, Hunan. [2] [3] [failed verification] In 1973, archeologists unearthed a number of wood scripts from a tomb in Hubei dating from the period of the Han dynasty (206 BCE to 220 CE ...

5. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   A number-line visualization of the algebraic addition 2 + 4 = 6. A "jump" that has a distance of 2 followed by another that is long as 4, is the same as a translation by 6. A number-line visualization of the unary addition 2 + 4 = 6. A translation by 4 is equivalent to four translations by 1.

6. Ruled paper - Wikipedia

   en.wikipedia.org/wiki/Ruled_paper

   Graph paper has horizontal and vertical lines evenly spaced over the entire page to create a grid of squares and is used for drafting, drawing and plotting graphs. Often every tenth or fifth line is bolded to assist in counting the lines when plotting data. Quadrille ruled paper (or quad paper) is similar to graph paper but without the bolded ...

7. Boomers are sad they may never be grandparents as fewer ... - AOL

   www.aol.com/finance/boomers-sad-may-never...

   The birth rate in America has long been on a decline, with the fertility rate reaching historic lows in 2023. More women between ages 25 to 44 aren’t having children, for a number of reasons.