Find the absolute and relative error for a calculator with incorrect rounding

A calculator is out of order. The calculator will round up every single number to the nearest integer if the value at the first decimal digit is 6 and above, or else it rounds down the number to be nearest integer. Calculate the absolute and relative error for the solution if we use the calculators to perform the following calculations:

a) $\sqrt{6.8} - \sqrt{6.3}$

b)$\frac{5}{9}+\frac{2}{3}.\frac{3}{5}$

I tried to round up or down the figure individually and my answer for the absolute error in a) is $0.9023$, for relative error is $9.2354$.

• Anyone help????????? – hk23214 Nov 23 '15 at 10:55
• i tried to round up or down the figure individually and my answer for the absolute error in a is 0.9023, for relative error is 9.2354 – hk23214 Nov 23 '15 at 13:43