1st Grade 1.OA.D.8 Math Operations Algebraic Thinking Printable Worksheet PDF. Common Core State Standard 1.OA.D.8 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
1st Grade 1.OA.D.8 Math Operations Algebraic Thinking Printable Worksheet PDF. Common Core State Standard 1.OA.D.8 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.