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The second portion of the document serves as an answer key, presenting the evaluated sums for each of the twenty problems, allowing students to verify their work and improve their self-assessment accuracy through immediate feedback. 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\n1. 500 + 200 + 300 =   2. 700 + 100 + 100 =   3. 100 + 800 + 700 =   4. 300 + 100 + 300 =   5. 900 + 300 + 700 =   6. 800 + 900 + 900 =   7. 400 + 100 + 800 =   8. 500 + 700 + 100 =   9. 300 + 500 + 600 =   10. 500 + 700 + 500 =   11. 500 + 800 + 300 =   12. 300 + 100 + 300 =   13. 700 + 300 + 900 =   14. 500 + 900 + 300 =   15. 300 + 400 + 500 =   16. 200 + 800 + 300 =   17. 300 + 600 + 500 =   18. 300 + 400 + 600 =    \n19. 500 + 100 + 500 =   20. 200 + 500 + 500 =    \nMental math: adding whole hundreds  \n (3 addends)   \nGrade 4 Addition Worksheet  \nFind the sum.  \n1. 500 + 200 + 300 =  1,000  2. 700 + 100 + 100 =  900   \n3. 100 + 800 + 700 =  1,600  4. 300 + 100 + 300 =  700   \n5. 900 + 300 + 700 =  1,900  6. 800 + 900 + 900 =  2,600   \n7. 400 + 100 + 800 =  1,300  8. 500 + 700 + 100 =  1,300   \n9. 300 + 500 + 600 =  1,400  10. 500 + 700 + 500 =  1,700   \n11. 500 + 800 + 300 =  1,600  12. 300 + 100 + 300 =  700   \n13. 700 + 300 + 900 =  1,900  14. 500 + 900 + 300 =  1,700   \n15. 300 + 400 + 500 =  1,200  16. 200 + 800 + 300 =  1,300   \n17. 300 + 600 + 500 =  1,400  18. 300 + 400 + 600 =  1,300   \n19. 500 + 100 + 500 =  1,100  20. 200 + 500 + 500 =  1,200","cbCaifAGQKbeqhFM","https://ap.wps.com/l/cbCaifAGQKbeqhFM","pdf",14490,"English","# Mental Math Practice\n## Answer Key","[{\"question\":\"What is the primary focus of this Grade 4 math worksheet?\",\"answer\":\"The worksheet focuses on practicing mental math skills specifically through the addition of three whole hundred addends.\"},{\"question\":\"How many addition problems are included in this practice set?\",\"answer\":\"There are 20 unique addition problems involving three-digit whole hundreds.\"},{\"question\":\"Does this worksheet provide the correct answers for verification?\",\"answer\":\"Yes, the second half of the document serves as an answer key that lists the calculated sums for all 20 problems.\"}]","Grade 4 Math - Adding Whole Hundreds with 3 Addends - Practice Worksheet | PDF"]