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The document includes a comprehensive answer key at the bottom, allowing students to check their work and verify their mathematical accuracy. 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numbers:  \n1)   + 60 + 60 = 200  \n4) 20 + 90 +   = 190  \n7) 40 +   + 50 = 100  \n10) 50 +   + 70 = 190  \n13) 90 +   + 30 = 160  \n16) 10 +   + 20 = 120  \n2)   + 40 + 60 = 120  \n5)   + 40 + 30 = 90  \n8) 40 + 90 +   = 160  \n11) 50 +   + 30 = 130  \n14) 30 +   + 20 = 80  \n17) 90 +   + 10 = 140  \n3)   + 60 + 50 = 140  \n6) 80 + 60 +   = 190  \n9) 70 + 60 +   = 140  \n12)   + 10 + 70 = 120  \n15)   + 20 + 50 = 80  \n18) 60 +   + 80 = 150  \nAnswers  \n1) 80 2) 20 3) 30  \n4) 80 5) 20 6) 50  \n7) 10 8) 30 9) 10  \n10) 70 11) 50 12) 40  \n13) 40 14) 30 15) 10  \n16) 90 17) 40 18) 10","cbCaiaVtgmylZS4K","https://ap.wps.com/l/cbCaiaVtgmylZS4K","pdf",27815,"English","# Addition Exercises\n## Answer Key","[{\"question\":\"What is the primary objective of this worksheet?\",\"answer\":\"The primary objective is to help second-grade students practice addition by finding missing numbers in equations involving the sum of three whole tens.\"},{\"question\":\"How many addition problems are included in this worksheet?\",\"answer\":\"This worksheet contains eighteen distinct addition problems for students to solve.\"},{\"question\":\"Are there answers provided for the exercises?\",\"answer\":\"Yes, a complete answer key is provided at the bottom of the worksheet to verify all eighteen calculations.\"}]","Grade 2 Addition Worksheet - Adding Whole Tens - Missing Numbers | PDF"]