Third graders learn to round whole numbers to the nearest ten and hundred by finding which ten or hundred a number sits closest to, and check what they know.
Students will be able to…
A lot has 68 cars, but about how many would you tell a friend? Rounding gives a close, friendly number. How do we find it?
Project this and answer each question about rounding to the nearest ten and hundred — read the explanation after each one.
Tap any phase to open the teacher moves and student actions.
A sign says 68 cars are in the lot. If a friend asks about how many, you would not say 68. What would you say?
Students answer questions about rounding.
Students round numbers to the nearest ten.
Students round using a number line.
Students reflect on rounding.
Aligned to the Common Core State Standards for Mathematics.
Use place value understanding to round whole numbers to the nearest 10 or 100.
Fluently add and subtract within 1000 using strategies based on place value.
Use place value understanding to round multi-digit whole numbers to any place.
Look for and make use of structure.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students draw a number line between two tens, mark the number, and round it to the closer end, so the idea of closest becomes something they can see. A printable rounding worksheet is in the Mathematics library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.