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The digital root of 679 = 6+7+9 = 22 The digital root of 22 = 2+2 = 4
9 + 5 + 2 = 16, 1 + 6 = 7 so the digital root is 7
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.
there is no square root of 11.
The square root of 121 is 11, because 11 x 11 = 121 * * * * * -11 is also a square root of 121.