Adding the Ones Column

Core Concepts

Focus on the very first step of double-digit addition: adding the numbers in the ones place. For these problems, the sum of the ones will always be 9 or less (no regrouping!).

Adding the Ones Column

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$$ 52 + 36 $$ What is the sum of the ones digits?

$$ 2 + 6 = 8 $$

In the problem $71 + 25$, what is the first addition step?

Add the ones: $1 + 5 = 6$.

$$ 43 + 43 $$ What is the sum of the ones digits?

$$ 3 + 3 = 6 $$

When adding two-digit numbers like $34 + 12$, which column do you add first?

You always add the ones column first. In this case, you would add $4 + 2$.

In the problem $52 + 36$, what are the two digits in the ones place?

The digits are $2$ and $6$.

$$ 28 + 61 $$ What is the sum of the ones digits?

$$ 8 + 1 = 9 $$

$$ 60 + 17 $$ What is the sum of the ones digits?

$$ 0 + 7 = 7 $$

If the sum of the ones is $5$ in an addition problem, what number do you write in the ones place of the answer?

You write a $5$.

What does 'no regrouping' mean when adding the ones column?

It means the sum of the ones digits is $9$ or less, so you don't have to carry over a ten to the next column.

$$ 15 + 82 $$ What is the sum of the ones column?

$$ 5 + 2 = 7 $$

$$ 33 + 54 $$ What is the first calculation you should perform?

Add the digits in the ones column: $3 + 4$.

The sum of the ones in an addition problem is $9$. Do you need to regroup?

No, you do not need to regroup. You only regroup if the sum is $10$ or more.

Adding the Ones Column

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