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Adding Means Putting Groups Together

with Lumi

Lumi sits at a sunny picnic table outdoors, carefully placing a group of red apples and a group of yellow apples into one big bowl, smiling as the bowl fills up with fruit.

Explain that adding means joining two groups into one group.
Identify the total as the number you get after putting two groups together.
Predict what happens to the number of objects when two groups are joined.
Calculate a simple sum by counting all objects after joining two groups.

Key terms

addition: Putting two or more groups together to make one bigger group.
sum: The total number you get after you add groups together.
addend: One of the groups, or numbers, you are joining together.
plus sign: The little + symbol that tells you to add groups together.

Joining Two Groups

When you add, you start with two separate groups and slide them into one place. None of the items disappear and none get added by magic — every single object that was in either group is still there in the new big group. Adding is just bringing them together so you can count them all at once.

Finding the Total

After you join the groups, the answer is called the sum or the total. To find it, count every object in the combined group, starting from one and going up. The last number you say is the sum. A neat shortcut is to start at the bigger group's number and count on, but counting all of them always works too.

Worked examples

Add 2 red apples and 3 yellow apples.

Put both groups into one bowl together.
Count every apple: 1, 2, 3, 4, 5.
The last number you say is the total.

Answer: 5 apples

Find the sum of 4 birds and 2 birds.

Start at the bigger number, 4.
Count on two more: 5, 6.
You stop at 6, so that is the total.

Answer: 6 birds

Hi there! I am Lumi, and today we are going to learn about adding. Adding means putting two groups together to make one group. Look at my picnic table. I have 2 red apples on one side. I have 3 yellow apples on the other side. When I put them all into one bowl, how many apples are there? Let us count together: 1, 2, 3, 4, 5. There are 5 apples! Here is a hint: when you add, you never lose any — you just bring them all together. Count every single one after you join the groups, and that is your total.

Activity

Drag each group of apples into the big bowl to put them together.

Practice

Theo has 3 stickers and finds 2 more stickers. How many stickers does he have now?

Join a group of 5 marbles and a group of 1 marble, then count them all.

Common mistakes to avoid

Adding makes things disappearAdding never removes objects; it brings every item into one group, so the total is always at least as big as each group.
The answer is just the bigger groupYou must count both groups together, because the smaller group still adds its objects to the total.

Check your understanding

There are 4 frogs on a lily pad and 2 frogs in the water. You put them all together. How many frogs are there now?

Maya has 1 block. She gets 3 more blocks. She puts them all in one pile. Which is true about her pile?

Recap

Adding means putting two groups together to make one group. The total, or sum, is the number you get when you count every object after joining. Adding always makes a group the same size or bigger, never smaller.

Reflect

When have you put two groups of toys or snacks together to find out how many you have in all?