Grade 4 Addition and Subtraction Studio

Use formal columns, estimate and check, then justify a two-step solution.

Grade 4 · original calculations · no voice

Calculation workspace

Complete every calculation decision, then check your thinking.

This pilot aligns only to uncovered Year 4 records MAT-0098–MAT-0100. It samples formal four-digit column addition and subtraction, estimation and inverse checks, and a justified contextual two-step solution; it does not complete the addition-and-subtraction unit, establish secure fluency, provide a lesson sequence or satisfy an assessment.

⌂ Orco Academy
🌱 Primary · Grades 3–5 · Mathematics

How “Grade 4 Addition and Subtraction Studio” works

🎓 You are learning to: Use formal columns, estimate and check, then justify a two-step solution.

Welcome! Three steps and you are learning:

  1. 🎯 Pick a mission

    Choose one from the menu at the top.

  2. 🧠 Think, then choose

    Pick the answer you could explain with a picture, a pattern or a number fact.

  3. ✅ Check yourself

    Before you press check, say your answer out loud — does it make sense? Then check and read the feedback.

Missions in this studio: Use formal columnar addition · Use formal columnar subtraction · Estimate and apply an inverse check · Solve and justify a two-step problem

💡 Top tip: if you get it wrong, that is useful — find out why before trying again.

Nothing you do here is saved or sent anywhere — experiment freely. Reopen this guide any time with the ? Help button.