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Estimating Difference
To estimate the difference , first round the
numbers. Then add. When estimating a
difference first decide what rounding will take
place.
Example word problem: The cafeteria had 367 apples
yesterday. The kids ate 194 of them to day.
About how many apples does the cafeteria have
left.
Example word problem: Round to the nearest ten.
Estimate to the nearest hundreds.
Kennedy saved up 624 pennies.  She wanted
some candy, so she use 339 of the pennies.
About how many pennies does she have left.
Round to the nearest ten.
624 - 339 = 285
The actual diffrence is
The actual difference is
367 - 194 = 173