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A comprehensive answer key is provided at the bottom of the page to facilitate immediate self-correction and objective assessment of the student's progress in mental math and algebraic thinking skills. 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Worksheet  \nFind the missing numbers:  \n1) 4400 +   = 9000  \n3) 5400 +   = 10000  \n5)   + 6800 = 10000  \n7) 6900 +   = 10000  \n9)   + 1000 = 10000  \n11)   + 1700 = 8000  \n13)   + 100 = 5000  \n15) 800 +   = 3000  \n2) 4900 +   = 5000  \n4) 1900 +   = 2000  \n6) 300 +   = 2000  \n8)   + 3800 = 6000  \n10)   + 4400 = 5000  \n12) 2600 +   = 5000  \n14)   + 5800 = 6000  \n16) 1200 +   = 8000  \nAnswers  \n1) 4600 2) 100  \n3) 4600 4) 100  \n5) 3200 6) 1700  \n7) 3100 8) 2200  \n9) 9000 10) 600  \n11) 6300 12) 2400  \n13) 4900 14) 200  \n15) 2200 16) 6800","cbCairPM3Ma1rkdM","https://ap.wps.com/l/cbCairPM3Ma1rkdM","pdf",19617,"English","# Addition Practice Problems\n## Answer Key","[{\"question\":\"What is the primary objective of this worksheet?\",\"answer\":\"The primary objective is to help third-grade students practice finding missing addends to complete whole thousands.\"},{\"question\":\"How many addition problems are included in the worksheet?\",\"answer\":\"There are sixteen individual addition problems provided for students to solve.\"},{\"question\":\"Is an answer key provided for verification?\",\"answer\":\"Yes, a complete answer key for all sixteen problems is included at the end of the document.\"}]","Grade 3 Addition Worksheet - Completing Whole Thousands | PDF"]