Question

write seven and nine tenths as a decimal number.

Explanation:

Step1: Identify whole number part

The whole number is 7.

Step2: Identify fractional part

Nine tenths is $\frac{9}{10} = 0.9$.

Step3: Combine whole and fractional parts

Add the whole number and the decimal fraction.
$7 + 0.9$

Answer:

7.9