The digital root of 679 = 6+7+9 = 22
The digital root of 22 = 2+2 = 4
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26.05
It is called the digital sum. If you keep doing it until you reach a single digit answer, it is called a digital root. The term digital root is sometimes also used for the digital sum. For example, 3042 gives the digital sum of 3+0+4+2 = 9 which is also its digital root. but 3047 gives the digital sum of 3+0+4+7 = 14 and the digital root is 1+4 = 5.
(4 factorial divided by .4) minus (the square root of 4 divided by .4) or 44 divided by (the square root of 4 divided by .4)
2 + 3 + 4 + ... + 38 = 740
Rounded to two decimal places, 61/4 x 61/4 = 2.45. Due to the rules of adding exponents in a multiplication sum involving exponents, this is equal to 6(1/4 + 1/4) or the square root of 6.