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2. Law of reciprocal proportions - Wikipedia

   en.wikipedia.org/wiki/Law_of_reciprocal_proportions

   This ratio of 1.19 obeys the law because it is a simple fraction (1/3) of 3.58. (This is because it corresponds to the formula ICl 3, which is one known compound of iodine and chlorine.) Similarly, hydrogen, carbon, and oxygen follow the law of reciprocal proportions. The acceptance of the law allowed tables of element equivalent weights to be ...

3. Tape diagram - Wikipedia

   en.wikipedia.org/wiki/Tape_diagram

   A tape diagram is a rectangular visual model resembling a piece of tape, that is used to assist with the calculation of ratios and addition, subtraction, and commonly multiplication. It is also known as a divided bar model, fraction strip, length model or strip diagram.

4. ISO 216 - Wikipedia

   en.wikipedia.org/wiki/ISO_216

   The ISO 216 formats are organized around the ratio 1: √ 2; two sheets next to each other together have the same ratio, sideways. In scaled photocopying, for example, two A4 sheets reduced to A5 size fit exactly onto one A4 sheet, and an A4 sheet in magnified size onto an A3 sheet; in each case, there is neither waste nor want.

5. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   In 493 AD, Victorius of Aquitaine wrote a 98-column multiplication table which gave (in Roman numerals) the product of every number from 2 to 50 times and the rows were "a list of numbers starting with one thousand, descending by hundreds to one hundred, then descending by tens to ten, then by ones to one, and then the fractions down to 1/144." [6]

6. Trigonometric tables - Wikipedia

   en.wikipedia.org/wiki/Trigonometric_tables

   In mathematics, tables of trigonometric functions are useful in a number of areas. Before the existence of pocket calculators, trigonometric tables were essential for navigation, science and engineering. The calculation of mathematical tables was an important area of study, which led to the development of the first mechanical computing devices.

7. Literacy in the United States - Wikipedia

   en.wikipedia.org/wiki/Literacy_in_the_United_States

   This article may need to be rewritten to comply with Wikipedia's quality standards, as article. You can help. The talk page may contain suggestions. (June 2024) First Lady Barbara Bush with New York City school children at the UNESCO International Literacy Day celebration in 1989 (the same year that the Barbara Bush Foundation for Family Literacy was launched) Adult literacy in the United ...