Curriculum placement
Grade 3. This describes the skill, not a learner estimate.
Rounding whole numbers
Round whole numbers to nearby tens and hundreds
Problem types
- Select the numbers that round to a hundred
- Round to the nearest ten
- Round to the nearest hundred
- Which number is the point?
- Round one number three ways
- Round each addend, then add
Builds on
Leads to
Related skills
- Comparing three-digit numbers · Related idea
Rounding to the nearest hundred compares a number with the halfway point between two hundreds.
- Sums and differences on a number line · Related idea
A number line cut into equal steps shows where a number lies between two hundreds. The halfway mark is what decides which hundred a number rounds to.
- Compare two-digit numbers · Related idea
Placing a number between two tens on a number line is the first step of rounding: it rounds to the closer ten.
- Adding or subtracting 10 or 100 mentally · Shared foundations
- Regrouping within 1,000 · Shared foundations
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