Add Two-Digit Numbers With Carrying - Arithmetic Step by Step

Add 47 + 38 column by column. The ones sum (7 + 8 = 15) is 10 or more, so write the 5 and carry the 1 to the tens column.

carry When a column sum reaches 10 or more, write only the ones digit and carry the tens digit to the next column on the left. The carry adds 1 to that column's sum.

Example

Add 47 and 38 with a carry from the ones column.

highlighted = computed this step

Step 1 — Set up

Line up the addends by place value.

\begin{array}{rrr}\phantom{x}&\phantom{x}&\phantom{x}\\&4&7\\+&3&8\\\hline\\\phantom{x}&\square&\square\end{array}

Step 2 — Ones column

Ones: 7 + 8 = 15, write 5, carry 1.

\begin{array}{rrr}\phantom{x}&\hl{1}&\phantom{x}\\&4&7\\+&3&8\\\hline\\\phantom{x}&\square&\hl{5}\end{array}

Step 3 — Tens column

Tens: 4 + 3 + carry 1 = 8, write 8.

\begin{array}{rrr}\phantom{x}&1&\phantom{x}\\&4&7\\+&3&8\\\hline\\\phantom{x}&\hl{8}&5\end{array}

Step 4 — Result

Read the complete answer: 85.

\begin{array}{rrr}\phantom{x}&\phantom{x}&\phantom{x}\\&4&7\\+&3&8\\\hline\\\phantom{x}&8&5\end{array},\quad \text{sum}=85