we know that
One very simple form of estimation is rounding.
To round off whole numbers:
Find the place value you want (the "rounding digit") and look to the digit just to the right of it.
If that digit is less than \(5\), do not change the "rounding digit" but change all digits to the right of the "rounding digit" to zero.
If that digit is greater than or equal to \(5\), add one to the rounding digit and change all digits to the right of the rounding digit to zero.
Part a) Estimate\((368+231)\) rounding the numbers to nearest hundreds
\(368\)
\(368 > 350\) ------> round up to \(400\)
\(231\)
\(231 < 250\) ------> round down to \(200\)
so
\((368+231)=400+200=600\)
therefore
the answer part a) is
\(600\)
Part b) Estimate \((368+231)\) rounding the numbers to nearest tens
\(368\)
\(68 > 65\) ------> round up to \(370\)
\(231\)
\(31 < 35\) ------> round down to \(230\)
so
\((368+231)=370+230=600\)
therefore
the answer part b) is
\(600\)
