Florida B.E.S.T. MA.3.NSO.1.4

Math3rd GradeUnderstand the place value of four-digit numbers.

The Standard

Round whole numbers from 0 to 1,000 to the nearest 10 or 100.

Florida B.E.S.T. Standards for Mathematics

Teacher's field guide

What Students Need to Do: Students use place value to find the closest multiple of 10 or 100. They identify the two benchmarks around a number and use the halfway point to decide which is nearer.
What Mastery Looks Like: Given any whole number through 1,000, students round accurately to the requested place. They can identify the surrounding benchmarks and explain how the halfway point determines the answer.
Common Misconceptions: Students may look at the wrong digit, round every digit, or forget to change trailing digits to zeros. They may round 5 down or miss that 950 rounds to 1,000 when rounding to the nearest hundred.
How to Assess It: Exit ticket: Round 347 to the nearest 10 and nearest 100, then show each answer on a labeled number line. Round 950 to the nearest 100 and explain your choice.

Lesson moves

Give pairs number cards and a floor number line; students stand between the bounding tens or hundreds, then move to the nearer benchmark.
Ask, “Why does 650 round to 700 rather than 600?” Students write an explanation using the words benchmark and halfway.
Play Rounding War: partners flip three digit cards, build a number, round to the called place, and keep cards for a correct answer.
Show ticket prices from $0 to $1,000; students round each price to estimate a class trip budget to the nearest ten or hundred dollars.

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