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2. Pattern Blocks - Wikipedia

   en.wikipedia.org/wiki/Pattern_blocks

   Pattern blocks were developed, along with a Teacher's Guide to their use, [1] at the Education Development Center in Newton, Massachusetts as part of the Elementary Science Study (ESS) project. [5] The first Trial Edition of the Teacher's Guide states: "Work on Pattern Blocks was begun by Edward Prenowitz in 1963.

3. Ford circle - Wikipedia

   en.wikipedia.org/wiki/Ford_circle

   Ford circles for p/q with q from 1 to 20. Circles with q ≤ 10 are labelled as ⁠ p / q ⁠ and color-coded according to q. Each circle is tangent to the base line and its neighboring circles. Irreducible fractions with the same denominator have circles of the same size.

4. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   (For example, "two-fifths" is the fraction ⁠ 2 / 5 ⁠ and "two fifths" is the same fraction understood as 2 instances of ⁠ 1 / 5 ⁠.) Fractions should always be hyphenated when used as adjectives. Alternatively, a fraction may be described by reading it out as the numerator "over" the denominator, with the denominator expressed as a ...

5. Magic circle (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Magic_circle_(mathematics)

   Ding Yidong magic circles – numbers on each circle (solid colour) sum to 200 and numbers on each diameter (dashed grey) sum to 325. Ding Yidong was a mathematician contemporary with Yang Hui. In his magic circle with 6 rings, the unit numbers of the 5 outer rings, combined with the unit number of the center ring, form the following magic square:

6. Group of rational points on the unit circle - Wikipedia

   en.wikipedia.org/wiki/Group_of_rational_points...

   3/5 + 4/5i and 5/13 + 12/13i (which correspond to the two most famous Pythagorean triples (3,4,5) and (5,12,13)) are rational points on the unit circle in the complex plane, and thus are elements of G. Their group product is −33/65 + 56/65i, which corresponds to the Pythagorean triple (33,56,65). The sum of the squares of the numerators 33 ...

7. Barbara Taylor Bradford, Best-Selling Author of “A Woman of ...

   www.aol.com/barbara-taylor-bradford-best-selling...

   The best-selling novelist Barbara Taylor Bradford has died. She was 91. The British-American author died “peacefully at her home” following a short illness on Sunday, Nov. 24, PEOPLE can confirm.