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Lesson: Estimating Sums of Three-Digit Numbers: Rounding Mathematics • 3rd Grade

In this lesson, we will learn how to round to the nearest ten or hundred to estimate the value of sums up to 1000.

Lesson Plan

Students will be able to

identify the digit with the highest place value in a three-digit number,
round three-digit addends to the highest place value,
estimate the sum of three-digit numbers by rounding to the nearest ten or hundred,
estimate the sum of three-digit numbers by rounding to the highest place value,
compare the accuracy of different estimates.

Lesson Video

Lesson Playlist

05:01
01:35
+2

03:35

Lesson Worksheet

Q1:

Look at how Sophia rounded to estimate this sum.

Round the numbers in this sum to the nearest ten.

Calculate the estimate.

Q2:

Look at how David estimated the sum.

Estimate the sum of by rounding both numbers first to the nearest hundred.

Estimate the sum of by rounding both numbers first to the nearest hundred.

Q3:

Look at this calculation.

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.

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