Class 2 Math: Numbers up to One Hundred Quick Revision Chapter Summary

Need to review the entire chapter before a test? This quick revision guide summarizes all the core concepts, topics, and equations taught in Class 2 Numbers up to One Hundred to help you refresh your memory instantly.

Core Topics At a Glance

### 📌 Counting 21 to 100 Counting from 21 to 100 is building numbers beyond 20, understanding groups of tens (twenty, thirty, forty...) up to one hundred.

### 📌 Tens and Ones representation Tens and Ones representation is showing two-digit numbers using base-10 blocks, where rods represent tens (10 units) and individual units represent ones.

### 📌 Number names Number names are the spelling words for numbers, helping kids write numbers (like writing 'twenty-four' for 24).

### 📌 Before, After, and Between Before refers to the number that is one less than a given number. After is one more. Between is the number in the middle of two numbers.

### 📌 Number line mapping A number line maps numbers as points along a straight line spaced at equal intervals, growing larger from left to right.

Key Formulas Mind Map

• Expanded Notation: `ab = 10a + b` - Expands two-digit number into ten-times tens value plus units....

Revision Checklist

1. Review the subtopic guides and outline notes.
2. Practice writing the key formulas from memory.
3. Solve at least 3 worked examples and check your steps.
4. Take a timed practice quiz to verify your speed.