1. 27,685 + 28,624Round 27,685 to 28,000Round 28,624 to 29,000Estimated sum: 28,000 + 29,000 = 57,0002. 58,123 + 14,678Round 58,123 to 58,000Round 14,678 to 15,000Estimated sum: 58,000 + 15,000 = 73,0003. 28,605 + 53,019Round 28,605 to 29,000Round 53,019 to 53,000Estimated sum: 29,000 + 53,000 = 82,0004. 45,676 + 34,547Round 45,676 to 46,000Round 34,547 to 35,000Estimated sum: 46,000 + 35,000 = 81,0005. 18,123 + 26,819Round 18,123 to 18,000Round 26,819 to 27,000Estimated sum: 18,000 + 27,000 = 45,0006. 57,103 + 11,829Round 57,103 to 57,000Round 11,829 to 12,000Estimated sum: 57,000 + 12,000 = 69,0007. 45,670 + 34,115Round 45,670 to 46,000Round 34,115 to 34,000Estimated sum: 46,000 + 34,000 = 80,0008. 73,292 + 23,500Round 73,292 to 73,000Round 23,500 to 24,000Estimated sum: 73,000 + 24,000 = 97,0009. 40,865 + 34,064Round 40,865 to 41,000Round 34,064 to 34,000Estimated sum: 41,000 + 34,000 = 75,00010. 67,261 + 22,902Round 67,261 to 67,000Round 22,902 to 23,000Estimated sum: 67,000 + 23,000 = 90,000