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Regroup tens and ones
Overview
You can find how many there are in all by adding groups of objects together. Sometimes the groups are big and sometimes they are small.
When we add larger numbers, sometimes we must REGROUP them.
Let’s look at the example below.
In the problem, we will add
16 + 25.
When we start in the ones column and add 6 + 5, the sum is 11. Any number larger than 9 must be regrouped.
We write the 1 in the ones column and then move the other 1 to the top of the tens column because we are regrouping.
Now, we are ready to add the tens also.
1 + 1 + 2 = 4.
Therefore, our answer is 41.
16
+
25
41
We circle ten ones to show how we regrouped them as a ten.
Let’s try a few more problems together!
In the problem, we will add
25 + 49.
When we start in the ones column and add 5 + 9, the sum is 14. Any number larger than 9 must be regrouped.
We write the 4 in the ones column and then move the other 1 to the top of the tens column because we are regrouping.
Now, we are ready to add the tens also.
1 + 2 + 4 = 7.
Therefore, our answer is 74.
25
+
49
74
We circle ten ones to show how we regrouped them as a ten.
In the problem, we will add
36 + 17.
When we start in the ones column and add 6 + 7, the sum is 13. Any number larger than 9 must be regrouped.
We write the 3 in the ones column and then move the other 1 to the top of the tens column because we are regrouping.
Now, we are ready to add the tens also.
1 + 3 + 1 = 5.
Therefore, our answer is 53.
36
+
17
53
We circle ten ones to show how we regrouped them as a ten.
In the problem, we will add
55 + 26.
When we start in the ones column and add 5 + 6, the sum is 11. Any number larger than 9 must be regrouped.
We write the 1 in the ones column and then move the other 1 to the top of the tens column because we are regrouping.
Now, we are ready to add the tens also.
1 + 5 + 2 = 8.
Therefore, our answer is 81.
55
+
26
81
We circle ten ones to show how we regrouped them as a ten.
Now, let’s practice!
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