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Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [ 4 ] As of December 2021, Quizlet has over 500 million user-generated flashcard sets and more than 60 million active users.
Abacus checkers is a traditional two-player game popular in China. The game is played on a five-plus-two bead suanpan abacus. Rules are grouped into three main categories: Halma -type, Checkers -type, and Go -type.
Board configurations vary among different games but also within variations of a given game; for example Endodoi is played on boards from 2×6 to 2×10. The largest are Tchouba ( Mozambique ) with a board of 160 (4×40) holes requiring 320 seeds, and En Gehé ( Tanzania ), played on longer rows with up to 50 pits (a total of 2×50=100) and using ...
The Stone is an online game developed by web company Abject Modernity Internet Creations Inc. in 1995. [1] The mystery game was created in 1996 but launched as a consumer product in 1997. People had to buy a physical stone containing the login credentials to the website, which was unheard of at the time. In 1999, The Stone was profiled by ...
An abacus (pl.: abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times in the ancient Near East, Europe, China, and Russia, until the adoption of the Hindu–Arabic numeral system. [1] An abacus consists of a two-dimensional array of slidable beads (or similar objects). In their ...
A suanpan (top) and a soroban (bottom). The two abaci seen here are of standard size and have thirteen rods each. Another variant of soroban. The soroban is composed of an odd number of columns or rods, each having beads: one separate bead having a value of five, called go-dama (五玉, ごだま, "five-bead") and four beads each having a value of one, called ichi-dama (一玉, いちだま ...
The abacus system of mental calculation is a system where users mentally visualize an abacus to carry out arithmetical calculations. [1] No physical abacus is used; only the answers are written down. Calculations can be made at great speed in this way.
The abacus in Norman work is square where the columns are small; but on larger piers it is sometimes octagonal, as at Waltham Abbey. The square of the abacus is often sculptured with ornaments, as at the White Tower and at Alton, Hampshire (fig. 2). In Early English work, the abacus is generally circular, and in larger work, a group of circles ...