This 3-page worksheet packet breaks Common Core 1.OA.8 into clear, manageable pieces—because sometimes learning math means taking it step by step, not all at once.
Originally created for a third grade special education student working to pass this first grade standard, this packet is designed for struggling learners, intervention groups, and anyone who needs a little extra time to figure out where the number belongs.
🎤 What’s Inside This Packet:
Page 1 – Addition Era
Students focus only on addition equations and practice one situation at a time:
- Part A: Missing number at the end (6 questions)
- Part B: Missing number in the middle (6 questions)
- Part C: Missing number at the beginning (6 questions)
Page 2 – Subtraction Era
Students repeat the same progression using subtraction, building confidence through familiarity and consistency.
Page 3 – The Remix
A mixed review page with 24 scrambled problems, combining all types of addition and subtraction missing-number equations—perfect as an assessment or mastery check.
✔ Answer Key Included for easy grading and quick feedback.
✨ Why Teachers Love It:
- Breaks a challenging standard into clear, teachable parts
- Supports special education, intervention, and remediation
1.OA.8 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ?– 3, 6 + 6 = ?.
Download this Unknown Number Packet!
You can download this packet by clicking on the purchase button below. You can find other math for your students on our math page!
P.S. This resource is also available for purchase from in our TPT Store if you want to do that!