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The provided content includes both a set of exercises and an answer key, making it an ideal resource for educators and parents to assess students' 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+ 28 =   2. 64 + 91 + 98 =   3. 79 + 31 + 41 =   4. 37 + 30 + 12 =   5. 75 + 67 + 38 =   6. 90 + 49 + 33 =   7. 54 + 39 + 26 =   8. 52 + 23 + 33 =   9. 67 + 44 + 52 =   10. 44 + 60 + 36 =   11. 39 + 39 + 53 =   12. 71 + 55 + 88 =   13. 61 + 99 + 67 =   14. 64 + 26 + 84 =   15. 36 + 84 + 60 =   16. 32 + 63 + 56 =   17. 88 + 63 + 44 =   18. 93 + 12 + 22 =    \n19. 44 + 17 + 74 =   20. 63 + 38 + 94 =    \nMental math: adding three 2-digit numbers   \nGrade 4 Addition Worksheet  \nFind the sum.  \n1. 84 + 18 + 28 =  130  2. 64 + 91 + 98 =  253   \n3. 79 + 31 + 41 =  151  4. 37 + 30 + 12 =  79   \n5. 75 + 67 + 38 =  180  6. 90 + 49 + 33 =  172   \n7. 54 + 39 + 26 =  119  8. 52 + 23 + 33 =  108   \n9. 67 + 44 + 52 =  163  10. 44 + 60 + 36 =  140   \n11. 39 + 39 + 53 =  131  12. 71 + 55 + 88 =  214   \n13. 61 + 99 + 67 =  227  14. 64 + 26 + 84 =  174   \n15. 36 + 84 + 60 =  180  16. 32 + 63 + 56 =  151   \n17. 88 + 63 + 44 =  195  18. 93 + 12 + 22 =  127   \n19. 44 + 17 + 74 =  135  20. 63 + 38 + 94 =  195","cbCaitW6kQiwnW9w","https://ap.wps.com/l/cbCaitW6kQiwnW9w","pdf",13365,"English","# Mental Math Exercises\n## Answer Key","[{\"question\":\"What is the primary focus of this worksheet?\",\"answer\":\"The worksheet is designed to help Grade 4 students practice adding three 2-digit numbers using mental math techniques.\"},{\"question\":\"How many addition problems are included in this document?\",\"answer\":\"There are twenty distinct addition problems provided for practice, followed by an answer key.\"},{\"question\":\"Who is the target audience for these math exercises?\",\"answer\":\"The exercises are specifically tailored for Grade 4 students to build their computational speed and accuracy.\"}]","Grade 4 Addition Worksheet - Mental Math Adding Three 2-Digit Numbers | PDF"]