Georgia 3.NR.1.3
The Standard
Use place value understanding to round whole numbers within up to 1000 to the nearest 10 or 100.
Georgia's K-12 Mathematics Standards · Use place value reasoning to represent, read, write, and compare numerical values up to 10,000 and round whole numbers up to 1,000.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students locate a number between two multiples of ten or two multiples of one hundred. They use the midpoint and place value to decide which multiple is closer.
What Mastery Looks Like
- A student identifies the two benchmark multiples around a number and finds the midpoint. They choose the closer multiple and round midpoint values up. They can explain their choice with place value or a number line.
Common Misconceptions
- Students may check the wrong digit, such as using the tens digit when rounding to the nearest ten. They may always round down or treat a midpoint as staying put. Some do not realize that 950 rounds to 1,000 when rounding to the nearest hundred.
How to Assess It
- Exit ticket: Round 347 to the nearest ten and nearest hundred. Draw or label a number line to justify both answers.
Lesson moves
Ways to Teach It
Place number cards on open number lines made from adding machine tape, then use clothespins to mark the nearest ten or hundred.
Ask students to explain why 349 rounds to 350 by tens but 300 by hundreds.
Play Rounding Match with number cards and rounded-value cards, awarding a point only when the player names both surrounding benchmarks.
Use a school fundraiser total of $684 and have students estimate it to the nearest $10 and $100 for a quick report.
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Printable 3.NR.1.3 Worksheet
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Use place value reasoning to represent, read, write, and compare numerical values up to 10,000 and round whole numbers up to 1,000.
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