1. The problem is to create mental math questions for class 3rd CBSE focusing on division and fractions. 2. Division is splitting a number into equal parts. The formula is $\text{Dividend} \div \text{Divisor} = \text{Quotient}$. 3. Fractions represent parts of a whole, written as $\frac{\text{Numerator}}{\text{Denominator}}$. 4. Example division question: What is $24 \div 6$? Solution: $24 \div 6 = 4$. 5. Example fraction question: What is $\frac{1}{2} + \frac{1}{4}$? Find a common denominator: $4$. Convert: $\frac{1}{2} = \frac{2}{4}$. Add: $\frac{2}{4} + \frac{1}{4} = \frac{3}{4}$. 6. These examples help students practice mental calculation by simplifying numbers and using basic fraction addition rules.