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Approximately four weeks (4 times 7 days) to a lunar month (synodic month = 29.54 days). Thus the number four is universally an integral part of primitive sacred calendars.

Solution to the puzzle: A popular mathematical pastime: Use exactly four 4s to form every integer from 0 to 50, using only the operators...

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We cancelled out 2 of the threes on top and the 2 threes on the bottom of the fraction, leaving 4 threes on the top (and the number 1 on the bottom). In general, for any number a (except 0) …

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Four is the maximum number of dimensions of a real division algebra (the quaternions), by a theorem of Ferdinand Georg Frobenius.

Created by teachers, learn how to show 4 in a ten frame. Learn to draw 4 tally marks. See the number 4 with objects that sometimes come to life for a fun surprise!

In this lesson, we will calculate the factors of 4, along with its prime factors, and its factors pairs. We will also solve some examples for a better understanding of the concept.