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\n1. 10 + 80 + 20 + 60 =   2. 30 + 80 + 20 + 10 =   3. 30 + 50 + 40 + 10 =   4. 50 + 90 + 10 + 20 =   5. 40 + 40 + 90 + 10 =   6. 30 + 60 + 50 + 50 =   7. 30 + 80 + 50 + 40 =   8. 90 + 30 + 50 + 20 =   9. 30 + 20 + 10 + 70 =   10. 60 + 70 + 90 + 30 =   11. 20 + 70 + 10 + 10 =   12. 60 + 30 + 80 + 10 =   13. 50 + 50 + 30 + 40 =   14. 30 + 50 + 60 + 50 =   15. 80 + 30 + 80 + 50 =   16. 30 + 60 + 60 + 30 =   17. 70 + 30 + 70 + 70 =   18. 10 + 80 + 50 + 50 =    \n19. 60 + 90 + 40 + 90 =   20. 70 + 10 + 50 + 80 =    \nMental math: adding whole tens  (four 2-digit addends)   \nGrade 4 Addition Worksheet  \nFind the sum.  \n1. 10 + 80 + 20 + 60 =  170  2. 30 + 80 + 20 + 10 =  140   \n3. 30 + 50 + 40 + 10 =  130  4. 50 + 90 + 10 + 20 =  170   \n5. 40 + 40 + 90 + 10 =  180  6. 30 + 60 + 50 + 50 =  190   \n7. 30 + 80 + 50 + 40 =  200  8. 90 + 30 + 50 + 20 =  190   \n9. 30 + 20 + 10 + 70 =  130  10. 60 + 70 + 90 + 30 =  250   \n11. 20 + 70 + 10 + 10 =  110  12. 60 + 30 + 80 + 10 =  180   \n13. 50 + 50 + 30 + 40 =  170  14. 30 + 50 + 60 + 50 =  190   \n15. 80 + 30 + 80 + 50 =  240  16. 30 + 60 + 60 + 30 =  180   \n17. 70 + 30 + 70 + 70 =  240  18. 10 + 80 + 50 + 50 =  190   \n19. 60 + 90 + 40 + 90 =  280  20. 70 + 10 + 50 + 80 =  210","cbCaig7331XKkHGu","https://ap.wps.com/l/cbCaig7331XKkHGu","pdf",13821,"English","# Mental Math Addition Problems\n## Addition Worksheet Solutions","[{\"question\":\"What is the core learning objective of this worksheet?\",\"answer\":\"The worksheet aims to help Grade 4 students practice and improve their mental math proficiency by adding four two-digit whole tens together.\"},{\"question\":\"How many addition problems are included in this document?\",\"answer\":\"There are 20 individual addition problems provided, each requiring the student to find the sum of four two-digit whole tens.\"},{\"question\":\"Does the document include answer keys for the practice problems?\",\"answer\":\"Yes, the document provides the complete list of 20 problems along with their correct sums, allowing students to check their own work or parents to review progress.\"}]","Mental Math - Adding Whole Tens - Grade 4 Addition Worksheet | PDF"]