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Ancient Egyptian sundial (c. 1500 BC), from the Valley of the Kings, used for measuring work hour. Daytime divided into 12 parts. The ancient Egyptians were one of the first cultures to widely divide days into generally agreed-upon equal parts, using early timekeeping devices such as sundials, shadow clocks, and merkhets (plumb-lines used by early astronomers).
In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card, into a slot on the time clock. When the time card hit a contact at the rear of the slot, the machine would print day and time information (a timestamp) on the card. One or more time cards could serve as a timesheet or
Spaced repetition is an evidence-based learning technique which incorporates increasing time intervals between each review of a flashcard in order to harness the spacing effect. Newly introduced and more difficult flashcards are shown more frequently, whereas older and less difficult flashcards are shown less frequently.
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Printable Worksheets: Subtraction Worksheets, One Digit Subtraction, Two Digit Subtraction, Four Digit Subtraction, and More Subtraction Worksheets; Subtraction Game at cut-the-knot; Subtraction on a Japanese abacus selected from Abacus: Mystery of the Bead
A story is composed of a plot, characters, setting, point of view, and theme. Informational books provide real-world knowledge for students and have unique features such as: headings, maps, vocabulary, and an index. Poems are written in different forms and the most commonly used are: rhymed verse, haikus, free verse, and narratives.
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