A whole is made of two parts. If you know one, you can find the other.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
Move them and see
The whole stays the same however the parts change.
8
5
3
Red group
Green group
5 and 3 make 8.
Apples in all
Red group
It is a number bond question
You know the whole and one part. The hidden part is the other one. Nothing new — the bond you already learned, with a piece covered.
Two ways to find it
Take the known part away from the whole, or count up from the part to the whole. Both give the same number.
Step 2: Try It Yourself
Tap and try it out.
9
6
3
Red group
Green group
6 and 3 make 9.
Step 3: Watch an Example
One step at a time.
Watch Mia Find the Hidden Part
Mia has 9 apples. 6 are red and the rest are green.
- Step 1
She knows the whole is 9.
Step 4: Your Turn
Practice makes it stick.
Sock Drawer
Problem 1 of 1
Leo has 8 socks. 3 are stripy and the rest are plain. How many are plain?
Find the Other Part
The whole and one part are given.
1 of 2
Whole 7, one part 2. What is the other part?
2 of 2
Whole 10, one part 6. What is the other part?
Step 5: Quick Check
Show what you know.
Question 1 of 2
Whole 9, one part 4. What is the other part?
Question 2 of 2
Whole 6, one part 1. What is the other part?
What You Learned
- A whole splits into two parts.
- Knowing one part tells you the other.
- Count up from the part you know.