You cant 128 is in simplified form
1/4
272 + 128 = 400
Square root of 400 simplified is 20.
341/400
0.128 = 128/1000. You can simplify that if you so wish.
128 as a percentage of 32 is 400% but 32 as a percentage of 128 is 25%
32/128 as a percentage = 100*32/128 % = 100/4 % = 25 %
It is 25/400 which you can simplify if required.
0.8889
Divide the numerator and the denominator by the same number to simplify a fraction. This number must be a common factor of the numerator and the denominator. For example, 50 is a common factor of the numerator and denominator of 350/400. By dividing each by 50, 350/400 can be simplified to 7/8.
An estimated difference is when you can't be bothered to calculate the exact number, so you simplify things a bit. An estimate for 800-something - 400-something would be 400.