Florida B.E.S.T. MA.2.NSO.1.4

Math2nd GradeUnderstand the place value of three-digit numbers.

The Standard

Round whole numbers from 0 to 100 to the nearest 10.

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

Teacher's field guide

What Students Need to Do: Students find the two multiples of 10 surrounding a number and decide which one is closer. When a number is halfway between, they round to the higher multiple of 10.
What Mastery Looks Like: Given 47, a student identifies 40 and 50, compares the distances, and answers 50. The student also rounds numbers ending in 5 to the next higher ten.
Common Misconceptions: Students may look at the tens digit instead of the ones digit. They may round numbers ending in 5 down, or miss that 4 rounds to 0 and 96 rounds to 100.
How to Assess It: Give an exit ticket: “Round 34, 65, and 98 to the nearest ten. Use a number line to explain one answer.”

Lesson moves

Give pairs a 0-to-100 floor number line, then have students place number cards and stand at the nearest multiple of 10.
Ask, “Mia says 45 rounds to 40 because 4 is less than 5. Is she correct?” Students explain with a number line.
Play Nearest Ten War: partners flip a number card, and the first player to state and justify the rounded value keeps it.
Show whole-dollar prices from $0 to $100, then have students estimate each cost to the nearest ten dollars before comparing estimates.

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