MathematicsBeginner

Odd and even numbers

Divisible by 2 or not

Estimated time · 7 min 9 Content blocks

Core concepts

Formulas

奇+奇=偶,奇+偶=奇\text{奇}+\text{奇}=\text{偶},\qquad \text{奇}+\text{偶}=\text{奇}

Worked example

Example
Solution

Worked example

Worked examples
Example
Solution steps
  1. 1
  2. 2
  3. 3
Answer

Worked example

Worked examples
Example
Solution steps
  1. 1
  2. 2
  3. 3
Answer

Worked example

Worked examples
Example
Solution steps
  1. 1
  2. 2
  3. 3
Answer

Exercises

Fill in the blank

Prerequisites

Practice set
Answered 0 / 6
1Fill in the blank

Tip

2Fill in the blank

Tip

3True / False

Tip

4True / False

Tip

5Fill in the blank

Tip

6True / False

Tip

Results are not saved — this session disappears when you leave.
AI DO LEARN

Science, made explorable.

5 Disciplines·6 Levels·647 Knowledge points

© 2026 AI DO LEARN. All rights reserved.

Original explanations, diagrams and code may not be republished without permission; please credit the source when quoting.