📘 Class 1 Mathematics – Chapter 1: Numbers (Counting)
Revision Notes with Solutions and Answers
1. Counting Numbers
-
Counting numbers are 1, 2, 3, 4, 5…
-
These are also called natural numbers.
-
Example: Count objects in the picture: 🍎🍎🍎 → 3 apples
2. Writing Numbers
-
Learn to write numbers 1 to 100.
-
Practice writing in rows for better understanding.
Example:
-
1, 2, 3, 4, 5 … 10
-
11, 12, 13, 14 … 20
3. Before, After, Between Numbers
-
Before: Number just before a given number
-
After: Number just after a given number
-
Between: Number that comes in the middle
Example:
-
Before 5 → 4
-
After 7 → 8
-
Between 2 and 4 → 3
4. Comparing Numbers
-
Symbols:
-
> → Greater than
-
< → Less than
-
= → Equal to
-
Example:
-
7 > 5
-
3 < 6
-
4 = 4
5. Even and Odd Numbers
-
Even Numbers: Can be divided by 2 → 2, 4, 6, 8, 10 …
-
Odd Numbers: Cannot be divided by 2 → 1, 3, 5, 7, 9 …
Example:
-
12 → Even
-
9 → Odd
6. Number Names
| Number | Name |
|---|---|
| 1 | One |
| 2 | Two |
| 3 | Three |
| 4 | Four |
| 5 | Five |
| 6 | Six |
| 7 | Seven |
| 8 | Eight |
| 9 | Nine |
| 10 | Ten |
Example:
-
Write 7 → Seven
-
Write 4 → Four
7. Addition (Small Numbers)
-
Adding two numbers: Combine objects and count total
Example 1:
-
3 + 2 = ?
-
🍎🍎🍎 + 🍎🍎 → 5
Answer: 5
Example 2:
-
4 + 3 = ?
-
🍌🍌🍌🍌 + 🍌🍌🍌 → 7
Answer: 7
8. Subtraction (Small Numbers)
-
Subtracting: Remove objects from a group
Example 1:
-
5 – 2 = ?
-
🍎🍎🍎🍎🍎 → Remove 2 → 🍎🍎🍎
Answer: 3
Example 2:
-
6 – 4 = ?
-
🍌🍌🍌🍌🍌🍌 → Remove 4 → 🍌🍌
Answer: 2
9. Practice Questions
1️⃣ Write the number that comes after 9 → 10
2️⃣ Write the number that comes before 15 → 14
3️⃣ Which is greater: 8 or 5? → 8
4️⃣ 7 + 2 = ? → 9
5️⃣ 10 – 6 = ? → 4
6️⃣ Is 12 even or odd? → Even
7️⃣ Number name of 6 → Six
8️⃣ Number between 4 and 6 → 5
✅ Quick Tip for Revision:
-
Practice counting objects, fingers, and toys
-
Write numbers 1–100 daily
-
Solve small addition and subtraction problems using objects
-
Learn even and odd numbers with examples