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numbers:  \n1) 20 +   + 10 = 120  \n4)   + 80 + 30 = 160  \n7) 30 +   + 20 = 140  \n10) 50 +   + 20 = 90  \n13) 80 +   + 90 = 190  \n16)   + 50 + 90 = 170  \n2)   + 90 + 50 = 220  \n5) 40 + 60 +   = 190  \n8) 90 + 10 +   = 130  \n11)   + 70 + 50 = 130  \n14) 80 +   + 20 = 130  \n17) 10 +   + 50 = 130  \n3) 70 +   + 80 = 210  \n6) 30 + 50 +   = 110  \n9)   + 70 + 10 = 120  \n12) 80 +   + 90 = 200  \n15)   + 60 + 70 = 160  \n18) 50 + 10 +   = 80  \nAnswers  \n1) 90 2) 80 3) 60  \n4) 50 5) 90 6) 30  \n7) 90 8) 30 9) 40  \n10) 20 11) 10 12) 30  \n13) 20 14) 30 15) 30  \n16) 30 17) 70 18) 20","cbCaieZ8vw5DtgvY","https://ap.wps.com/l/cbCaieZ8vw5DtgvY","pdf",27590,"English","# Addition Practice Exercises\n## Answer Key","[{\"question\":\"What is the purpose of this worksheet?\",\"answer\":\"This worksheet is designed to help second-grade students practice addition by finding missing numbers in equations involving three whole tens.\"},{\"question\":\"How many problems are included in the exercise?\",\"answer\":\"The document contains 18 separate addition problems that require solving for a missing addend.\"},{\"question\":\"Are the answers provided for the exercises?\",\"answer\":\"Yes, a complete answer key is included at the end of the document, listing the correct missing number for each of the 18 problems.\"}]","Grade 2 Addition Worksheet - Adding Whole Tens - Missing Numbers | PDF"]