The "Carry Over" Move: How to Regroup

Core Concepts

You've added the ones and the sum is 10 or more. Now what? This stack breaks down the exact steps of regrouping the ones and carrying the new ten over to the tens column.

The "Carry Over" Move: How to Regroup

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If you add the ones and get a sum of \(14\), what digit do you write in the ones place of the answer?

You write the \(4\) in the ones place.

If you add the ones and get a sum of \(14\), what do you do with the \(1\) (the ten)?

You 'carry' the \(1\) to the top of the tens column to be added with the other tens.

In the problem \(28 + 35\), the ones add up to \(8+5 = 13\). What happens next?

Write the \(3\) in the ones place of the answer and carry the \(1\) to the tens column.

In the problem \(49 + 21\), the ones add up to \(9+1 = 10\). What do you write in the ones place?

You write a \(0\) in the ones place.

In the problem \(49 + 21\), the ones add up to \(9+1 = 10\). What do you carry to the tens column?

You carry the \(1\) to the tens column.

Let's look at the ones in \(56 + 27\). \(6+7=13\). What do you write in ones and what do you carry to the tens column?

The \(3\) stays in the ones place, and the \(1\) ten gets carried over.

You are adding \(17 + 37\). The ones are \(7+7=14\). What do you write in ones and what do you carry to the tens column?

The \(4\) stays in the ones place, and the \(1\) ten gets carried over.

A small, carried-over \(1\) at the top of the tens column represents what actual value?

It represents one group of ten, or the value \(10\).

If the ones column adds up to \(18\), what do you write down and what do you carry?

Write \(8\) in the ones place, carry \(1\) to the tens place.

Challenge: If adding a long column of numbers, the ones add up to \(21\). What do you write and what do you carry?

Write \(1\) in the ones place, and carry a \(2\) (for two tens) to the tens place.

The "Carry Over" Move: How to Regroup

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