Addition & Subtraction 3.NBT.A.2 Practice Question Lumos StepUp: TNReady Online Practice and Assessments - Grade 3 Mathematics

Lumos StepUp: TNReady Online Practice and Assessments - Grade 3 Mathematics Addition & Subtraction

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Lindsay has a large container of marbles. Ashley gave her 638 marbles. Now she has 997 marbles. How many did she have before?