To convert 1.25 into a mixed number, follow these steps:
1. **Identify the Whole Number Part:**
The number 1.25 has a whole number part, which is 1.
2. **Convert the Decimal to a Fraction:**
The decimal part is 0.25. To convert 0.25 to a fraction, recognize that 0.25 is equivalent to 25/100.
3. **Simplify the Fraction:**
Simplify 25/100 by dividing both the numerator and the denominator by their greatest common divisor (GCD), which is 25.
25 ÷ 25 = 1
100 ÷ 25 = 4
So, 25/100 simplifies to 1/4.
4. **Combine the Whole Number and the Fraction:**
Combine the whole number part (1) with the simplified fraction (1/4) to form the mixed number.
Therefore, 1.25 as a mixed number is **1 1/4**.