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The second section includes the complete answer key, serving as a comprehensive resource for teachers and students to assess performance and verify results during learning sessions or independent practice. 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is the primary focus of this Grade 4 worksheet?","Question",{"text":62,"@type":63},"The worksheet focuses on improving mental math skills by requiring students to find the sum of four 2-digit whole tens.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"How many practice problems are provided in this document?",{"text":67,"@type":63},"The document contains twenty individual addition problems for students to solve.",{"name":69,"@type":60,"acceptedAnswer":70},"Is there a provided solution key for the practice problems?",{"text":71,"@type":63},"Yes, the second page of the document provides the correct sums for all twenty addition problems presented in the 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\n1. 90 + 50 + 60 + 70 =   2. 50 + 50 + 70 + 40 =   3. 30 + 50 + 40 + 90 =   4. 40 + 40 + 50 + 30 =   5. 70 + 60 + 70 + 20 =   6. 90 + 90 + 50 + 30 =   7. 20 + 50 + 40 + 20 =   8. 70 + 60 + 80 + 30 =   9. 10 + 90 + 80 + 50 =   10. 60 + 60 + 50 + 60 =   11. 70 + 50 + 50 + 60 =   12. 90 + 70 + 30 + 10 =   13. 30 + 70 + 70 + 70 =   14. 30 + 50 + 50 + 90 =   15. 70 + 10 + 60 + 20 =   16. 80 + 70 + 20 + 20 =   17. 50 + 50 + 50 + 90 =   18. 20 + 40 + 60 + 20 =    \n19. 20 + 60 + 30 + 20 =   20. 20 + 20 + 80 + 20 =    \nMental math: adding whole tens  (four 2-digit addends)   \nGrade 4 Addition Worksheet  \nFind the sum.  \n1. 90 + 50 + 60 + 70 =  270  2. 50 + 50 + 70 + 40 =  210   \n3. 30 + 50 + 40 + 90 =  210  4. 40 + 40 + 50 + 30 =  160   \n5. 70 + 60 + 70 + 20 =  220  6. 90 + 90 + 50 + 30 =  260   \n7. 20 + 50 + 40 + 20 =  130  8. 70 + 60 + 80 + 30 =  240   \n9. 10 + 90 + 80 + 50 =  230  10. 60 + 60 + 50 + 60 =  230   \n11. 70 + 50 + 50 + 60 =  230  12. 90 + 70 + 30 + 10 =  200   \n13. 30 + 70 + 70 + 70 =  240  14. 30 + 50 + 50 + 90 =  220   \n15. 70 + 10 + 60 + 20 =  160  16. 80 + 70 + 20 + 20 =  190   \n17. 50 + 50 + 50 + 90 =  240  18. 20 + 40 + 60 + 20 =  140   \n19. 20 + 60 + 30 + 20 =  130  20. 20 + 20 + 80 + 20 =  140","cbCaijOpvxVLpVJV","https://ap.wps.com/l/cbCaijOpvxVLpVJV","pdf",13792,"English","# Mental Math Practice Problems\n## Answer Key","[{\"question\":\"What is the primary focus of this Grade 4 worksheet?\",\"answer\":\"The worksheet focuses on improving mental math skills by requiring students to find the sum of four 2-digit whole tens.\"},{\"question\":\"How many practice problems are provided in this document?\",\"answer\":\"The document contains twenty individual addition problems for students to solve.\"},{\"question\":\"Is there a provided solution key for the practice problems?\",\"answer\":\"Yes, the second page of the document provides the correct sums for all twenty addition problems presented in the worksheet.\"}]","Mental Math - Adding Whole Tens - Grade 4 Addition Worksheet | PDF"]