4·53·69)213
4 ---
---+--------
41|53
|41
+----
423|1269
|1269
+----
|
(1) Point off the number into periods of two figures each, as before.
(2) The square root of the first period is 2. 2 × 2 = 4. Write the 2 in
the root and subtract the 4 from 4. Bring down the next period, 53.
(3) 2 × 2 = 4. (Remember the 4 is to be used as a trial divisor, being 2
× the _tens_.)