In this Grade 4 Eureka Math lesson, students learn to round five- and six-digit numbers to the nearest ten thousand and hundred thousand using a vertical number line. They practice identifying endpoints and midpoints on the number line to determine which benchmark a number is closest to, then apply rounding to estimate sums and differences in addition and subtraction problems. The lesson builds place value understanding with multi-digit numbers up to the hundred thousands place.
Section 1
Rounding to the Nearest Ten Thousand and Hundred Thousand
To round a number to a specific place value, identify the lower endpoint and upper endpoint. Find the midpoint.
Section 2
Estimating Sums and Differences by Rounding
To estimate a sum or difference, first round each number to a specified place value, then perform the addition or subtraction on the rounded numbers. The result is an approximation, denoted by the symbol. For numbers and , an estimated sum is and an estimated difference is .
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Section 1
Rounding to the Nearest Ten Thousand and Hundred Thousand
To round a number to a specific place value, identify the lower endpoint and upper endpoint. Find the midpoint.
Section 2
Estimating Sums and Differences by Rounding
To estimate a sum or difference, first round each number to a specified place value, then perform the addition or subtraction on the rounded numbers. The result is an approximation, denoted by the symbol. For numbers and , an estimated sum is and an estimated difference is .
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter