Anchor Chart · Grades 3-4 · 3.NBT.A.1 | 4.NBT.A.3
Rounding
A rounded number answers one question: about how much is it?
↺The Rounding Hill
Digits 1-4 slide back down. Digits 5-9 roll over the top.
1Underline the Place, Circle Next Door
Round to the nearest ten:
327
Round to the nearest ten thousand:
458,604
The underlined digit is the one that changes (or doesn't). The circled neighbor decides.
2Let the Neighbor Decide
4 or lessthe digit stays
5 or morethe digit goes up 1
7 is 5 or more → the 2 becomes a 3 (327 → 330)
8 is 5 or more → the 5 becomes a 6 (458,604 → 460,000)
The underlined digit goes up by one or stays the same.
3Zeros to the Right
327 → 330
458,604 → 460,000
Every digit to the right becomes a zero. Digits to the left stay the same, unless the underlined digit is a 9 that rounds up.
