1.OA.D.8 — Free Activities & Worksheets
Free Common Core 1.OA.D.8 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.D.8
Interactive activities
Grade 1·1.OA.D.8
Find the Missing Number
Work out the missing number in each equation, then match it to its answer. The blank moves around — sometimes it's an addend, sometimes the number you take away, sometimes the total — so you get to think it through every way. Tap an equation, then tap the number that makes it true, and watch the pair link. Aligned to Common Core 1.OA.D.8 — finding the unknown whole number in an addition or subtraction equation, in any position.
Try itRelated standards in 1.OA
Frequently asked questions
- What is covered under 1.OA.D.8?
- 1.OA.D.8 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.D.8 resources free?
- Yes. Every activity and worksheet aligned to 1.OA.D.8 is free to use online and to print — no signup and no paywall.
- Who are these 1.OA.D.8 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.