Explain how to estimate 368+231 two different ways

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 , 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 , add one to the rounding digit and change all digits to the right of the rounding digit to zero.

Part a) Estimate rounding the numbers to nearest hundreds

------> round up to

------> round down to

so

therefore

the answer part a) is

Part b) Estimate rounding the numbers to nearest tens

------> round up to

------> round down to

so

therefore

the answer part b) is

answer for #1 is c

answer for #2 is d

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