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Show neat work. (No calculators. )  \nPART A—Warm-Up  \n1. 324 + 158 =   3. 615 + 209 =    \n2. 407 + 296 =   4. 780 + 145 =    \nPART B—Core Practice  \n5. 6. 7.  \n268 + 147  \n509 + 386  \n734 + 198  \n8. 9. 10.  \n1  \nMashup Math LLC | Al[l Rights Reserved | Get More K-12 Math Worksheets at ](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)[www.mashupmath.com](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)  \nPART C—Error Analysis (13–14)  \nDirections: Each problem below has a mistake. Write the correct sum.  \n14. Marty solved an addition problem as follows:  \n438  \n + 276  \n604  \nIs the final answer correct? YES NO  \nIf the final answer is incorrect, what is the correct sum?    \nExplain, in one sentence, where the mistake was made:  \n15. Kenji solved an addition problem as follows:  \n509 + 187  \n686  \nIs the final answer correct? YES NO  \nIf the final answer is incorrect, what is the correct sum?   Explain, in one sentence, where the mistake was made:  \n2  \nMashup Math LLC | Al[l Rights Reserved | Get More K-12 Math Worksheets at ](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)[www.mashupmath.com](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)  \nCHALLENGE PROBLEM (Show your thinking)  \n16. A museum sold 367 tickets on Saturday and 458 tickets on Sunday.  \na) Estimate the total by rounding each number to the nearest hundred:    \nb) Find the exact total:    \nc) Explain in one sentence why your estimate is reasonable:  \nMashup Math LLC | Al[l Rights Reserved | Get More K-12 Math Worksheets at ](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)[www.mashupmath.com](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)  \n3  \nAnswer Key  \nPart A—Warm-Up  \n1. 324 + 158 = 482  \n2. 407 + 296 = 703  \n3. 615 + 209 = 824  \n4. 780 + 145 = 925  \nPart B—Core Practice  \n5. 268 + 147 = 415  \n6. 509 + 386 = 895  \n7. 734 + 198 = 932  \n8. 406 + 275 = 681  \n9. 851 + 349 = 1,200  \n10. 620 + 489 = 1,109  \n11.975 + 128 = 1,103  \n12.703 + 259 = 962  \n13.777 + 888 = 1,665  \nPart C—Error Analysis  \n14. NO  \nCorrect sum: 714  \nMistake (one sentence): They didn’t regroup correctly (8 + 2 + 1 should be 11, not 10) .  \n15. NO  \nCorrect sum: 696  \nMistake (one sentence): They forgot to add the regrouped 1 hundred (5 + 1 + 1 = 7 hundreds) .  \nChallenge Problem  \n16a) Estimate (nearest hundred): 367 ≈ 400 and 458 ≈ 500 → 900  \n16b) Exact total: 367 + 458 = 825  \n16c) Example sentence: 900 is reasonable because rounding both numbers to the nearest hundred gives a close estimate to 825.  \n4  \nMashup Math LLC | Al[l Rights Reserved | Get More K-12 Math Worksheets at ](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)[www.mashupmath.com](l Rights Reserved | Get More K-12 Math Worksheets at www.mashupmath.com)","cbCaijJJgicf5D4i","https://ap.wps.com/l/cbCaijJJgicf5D4i","pdf",1987185,"English","# PART A—Warm-Up\n# PART B—Core Practice\n# PART C—Error Analysis\n## Challenge Problem","[{\"question\":\"What directions apply to the addition problems on the worksheet?\",\"answer\":\"Add each sum and show neat work. Calculators are not allowed.\"},{\"question\":\"What does the Error Analysis section require?\",\"answer\":\"Each problem contains a mistake; write the correct sum and explain the error in one sentence.\"},{\"question\":\"How is the challenge problem solved in parts a–c?\",\"answer\":\"Estimate by rounding each number to the nearest hundred, compute the exact total, then explain why the estimate is reasonable in one sentence.\"}]","Practice Adding 3-Digit Numbers - Directions and Answer Key | PDF",1790132765]