Number Bonds to 8: Part-Whole Relationships

Free sample questions, a clear explanation, and 5 practice skills with an AI tutor that guides without giving the answer away.

Super 8! Let's Make Number Bonds!

Hello, Math Explorer! Have you ever shared a snack with a friend? Imagine you have a big bunch of 8 yummy grapes. That big bunch is your Whole number.

Now, what if you give your friend 3 grapes and keep 5 for yourself? You've split the grapes into two smaller groups. These smaller groups are called Parts. But guess what? When you put them back together, you still have 8 grapes in total! That's a number bond!

Key Takeaway!

A number bond shows us how a 'whole' number is made of two smaller 'parts'. The two parts always add up to make the whole!

All the Ways to Make 8!

The number 8 is like a team captain with many different partner pairs. Let's look at some of the teams that make 8!

🔵🔵🔵🔵🔵🔵🔵 + 🔵 7 and 1 make 8. So, 7 + 1 = 8
🟣🟣🟣🟣🟣🟣 + 🟣🟣 6 and 2 make 8. So, 6 + 2 = 8
🟢🟢🟢🟢🟢 + 🟢🟢🟢 5 and 3 make 8. So, 5 + 3 = 8
🟠🟠🟠🟠 + 🟠🟠🟠🟠 4 and 4 make 8. So, 4 + 4 = 8

Let's Be a Math Detective! 🕵️‍♀️

Here's a puzzle for you:

There are 8 birds on a branch. This is our Whole.
Then, 3 birds fly away. This is one Part.
How many birds are left? What's the missing part?

We know the whole is 8 and one part is 3. We need to find the other part! Let's think... what number goes with 3 to make 8? That's right, it's 5!

So, 5 birds are left! The number bond equation is 5 + 3 = 8.

Wow, you are a number bond champion! Keep finding parts and wholes all around you!

Sample questions

1. You have 8 yummy apples. If 3 of them are red, how many apples are green?

○ 3

✓ 5

○ 8

○ 4

Answer: 5 — Start with 8 apples. If 3 are red, count how many are left to be green.

2. There are 8 colorful blocks in a box. If 2 blocks are blue, how many blocks are yellow?

○ 2

○ 5

✓ 6

○ 8

Answer: 6 — Imagine 8 blocks. Take away the 2 blue ones. How many yellow ones are left?

3. You have 8 delicious cookies. You eat 4 of them. How many cookies are left?

✓ 4

○ 3

○ 8

○ 5

Answer: 4 — If you start with 8 and 4 are gone, count what's still there.

Skills in this topic

Decompose a set of 8 objects into two parts using concrete manipulatives.
Compose a set of 8 objects from two parts using concrete manipulatives.
Represent number bonds for 8 using pictorial models.
Write number bond equations for 8.
Solve a problem: 'There are 8 birds on a branch. If 3 fly away, how many are left? What number bond describes this?'

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