13 Questions Addition: Multi-Digit Numbers – MATH Fluently add multi-digit whole numbers using the standard algorithm . What is the sum of 125 and 439? 564 555 314 1,689 Solve. 5,538 10,764 8,764 11,874 Solve. 5,907 2,398 1,574 1,319 … and 10 more awesome questions! Check them out by clicking “Play”.