To convert the mixed number 1 1/4 into a decimal, we need to break it down into its components. The mixed number consists of a whole number (1) and a fraction (1/4).
First, we convert the fraction 1/4 into a decimal. We can do this by dividing the numerator (1) by the denominator (4):
1 ÷ 4 = 0.25
Now, we add this decimal to the whole number part.
So:
1 + 0.25 = 1.25
Thus, 1 1/4 as a decimal is 1.25.