What is covered under 3.NBT.A.1?

3.NBT.A.1 sits in the Number & Operations in Base Ten strand for Grade 3. This page gathers the free interactive activities and worksheets aligned to it.

Are these 3.NBT.A.1 resources free?

Yes. Every activity and worksheet aligned to 3.NBT.A.1 is free to use online and to print — no signup and no paywall.

Who are these 3.NBT.A.1 activities for?

They are built for Grade 3 teachers and learners following the Common Core Number & Operations in Base Ten progression, and work for class, small-group, or home practice.

3.NBT.A.1 — Free Activities & Worksheets

Free Common Core 3.NBT.A.1 activities and worksheets for Grade 3, aligned to the Number & Operations in Base Ten strand. Browser-playable interactive exercises plus printable PDFs, available in all 11 supported languages — no signup, no paywall.

Grade 3·Number & Operations in Base Ten·3.NBT.A.1

Interactive activities

Grade 3·3.NBT.A.1

The Halfway Harbors — Rounding on a Number Line (Grade 3)

A free interactive Grade 3 math activity: help Marina the lighthouse-cat send each little boat to its nearest round-number harbor. See where the boat sits on the number line, find the halfway buoy in the middle, and tap the harbor it is closest to — rounding to the nearest 10 and the nearest 100. Common Core 3.NBT.A.1.

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Frequently asked questions

What is covered under 3.NBT.A.1?: 3.NBT.A.1 sits in the Number & Operations in Base Ten strand for Grade 3. This page gathers the free interactive activities and worksheets aligned to it.
Are these 3.NBT.A.1 resources free?: Yes. Every activity and worksheet aligned to 3.NBT.A.1 is free to use online and to print — no signup and no paywall.
Who are these 3.NBT.A.1 activities for?: They are built for Grade 3 teachers and learners following the Common Core Number & Operations in Base Ten progression, and work for class, small-group, or home practice.