I’m gonna explain how to find the square root of 39.

1st you would 6*6=36. Then 7*7=49.

2nd you would draw a number line on your white board. you would find your half way point.

3rd you would add 36+6.5=42.5.

last you would see if 39 is closer to 42.5 or 49 is closer to 42.5.  Its closer to 39.