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 lesslet it rest
5 or moreraise the score
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)
Only the underlined digit ever changes - by one, or not at all.
3Zeros to the Right
327 → 330
458,604 → 460,000
Every digit to the right becomes a zero. Digits to the left don't move.
