Use formal columns, estimate and check, then justify a two-step solution.
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.
🎓 You are learning to: Use formal columns, estimate and check, then justify a two-step solution.
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Pick the answer you could explain with a picture, a pattern or a number fact.
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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
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