Carry-Over Help: Two-Digit AdditionOnline version Two-digit addition with carry explained. by Arnab Biswas Boy Ms. Carter, can you help me with adding two-digit numbers that need a carry? Teacher Of course! When the ones digits add to 10 or more, you carry to the tens. Boy Like with 47 plus 26—how do we start? Teacher First add the ones: 7 + 6 = 13. Write down 3 and carry 1. Boy So the 1 goes to the tens column? Teacher Exactly. Now add the tens: 4 + 2 + 1 = 7. Write 7 in the tens place. Boy That gives 73. Is that correct? Teacher Yes! 47 + 26 = 73, with a carry from ones to tens. Boy Can we try another one, like 58 + 67? Teacher Sure. 8 + 7 = 15; write 5, carry 1; tens: 5 + 6 + 1 = 12; write 2 and carry 1 to hundreds; hundreds: 1; result 125.