Grade K · Operations & Algebraic Thinking
Number Pairs Within 5
Break a number into two parts in more than one way.
A whole can be split different ways
Five can be made from 0 and 5, 1 and 4, 2 and 3, and the reversed pairs. The whole stays five even when the parts change.
Record the relationship
A number bond can be written as an equation such as 5 = 2 + 3.
Key terms
Words to know
- Compose
- Put parts together to make a whole.
- Decompose
- Break a whole into parts.
- Number bond
- A picture showing how parts combine to make a whole.
- Equation
- A statement showing that two mathematical expressions are equal.
Interactive math lab · 🧱 blocks
Change it. See it. Understand it.
Split the blocks into two groups. The whole stays 5.
5 = 2 + 3
| Whole | 5 |
|---|---|
| Part A | 2 |
| Part B | 3 |
Worked examples
See the idea in action.
Two and three are parts that combine to make five.
The same whole can be decomposed a different way.
Guided practice
Work through 20 questions, one step at a time.
Choose an answer, check your reasoning, then move forward. Your score updates as you go.
What number is one more than 1?
Curriculum reference
Built as a continuous K–12 progression.
The sequence follows widely used K–12 mathematics progressions and references the Common Core mathematics framework. Explanations, examples, interactive models, and practice questions are original FreeLearnHub material.