1.OA.A.1 — Free Activities & Worksheets

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

Grade 1·Operations & Algebraic Thinking·1.OA.A.1

Interactive activities

Grade 1·1.OA.A.1

Find the Total — Add Two Parts Within 20 (Grade 1)

A free interactive Grade 1 math activity: a number bond shows two parts — count how many there are in all and type the total. Putting together to add within 20. Common Core 1.OA.A.1.

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Grade 1·1.OA.A.1

Vet's Diagnosis Window — Word-Problem Modeling

A shy little animal shuffles into the woodland vet clinic, and its symptom is a number STORY. Watch the x-ray act out what happened, then model it: place each amount in its spot, mark the mystery part, and dial the answer to clear the x-ray and heal your patient. A warm Grade 1 game about adding and subtracting within 20 to solve word problems with unknowns in every position, aligned to Common Core 1.OA.A.1.

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Related standards in 1.OA

Frequently asked questions

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