Worksheet: Estimating Sums of Three-Digit Numbers: Rounding
In this worksheet, we will practice rounding to the nearest ten or hundred to estimate the value of sums up to 1000.
Look at how Scarlett rounded to estimate this sum.
Round the numbers in this sum to the nearest ten.
Calculate the estimate.
Emma won 586 tickets at the fair. Her sister won 379.
Pick the best estimate for the total number of tickets that they won.
Elizabeth is going on vacation. She will travel 215 miles by train and 682 miles by plane.
Which calculation do you need to do to figure out how many miles she will travel altogether?
Estimate the answer by rounding both numbers to the nearest hundred.
Estimate the answer by rounding both numbers to the nearest ten.
Find the exact answer.
Tip: Use the estimates to see if your answer is sensible.