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Zero has no factors
take from each two equal numbers on
if a number remain once, take the square root of that number
common square roots
2 : 1.414213562
3 : 1.732050808
5 : 2.236067977
7 : 2.645751311
11 : 3.31662479
13 : 3.605551275
17 : 4.123105626
19 : 4.358898944
Notes
square root of 6= √ 3 X √ 2
estimate the square root of any number:
- find smaller number have root
- find bigger number have a root
- subtract the smaller number from the bigger number
- subtract the smaller number from that number
- add the result of step 4 / step 3 to that number
example
what square root of 19
step 1 is 16
from step2 is 25
from step3 is 9
step 4 result: 4+ 3/9
estimated equel: 4.33
the real value is 4.35